Does a mental health disorder always accompany murder or rape?

So, I've been seeing what I view as a lot of justification for murder or rape because the said abuser must have a 'mental health disorder', is it possible that one could be a murder or rapist because they're violent and disgusting, without having mental health issues?

No, you could just be evil and possessed by the devil to

murder and rape.

You don't have to be mental ill to do bad things like murder and rape. I have mental illnesses and I am not going out murdering or raping people. I know it is a sick world out there, but not everyone is mentally ill to commit such acts.

Not always but Post Traumatic Stress Disorder is common

most, if not all rapists have had something tragic in their childhood to make them want to harm other people
in most murdercases, you will find that trouble in their life started when they were just kids, usualywith bad parents.

ive been studying a lot about serial killers/rapists and most of them have something not right up there.

Sort answer - yes, it is possible that one could murder or rape someone just because they're violent and disgusting.
The same could be applied to anything.
Even people like paedophiles don't do things just because they're "violent and disgusting," they may have some underlying mental health problem which makes them attracted to children.
The same thing as you said, or even in reverse, could be applied to almost any situation.

A lot of people who rape or murder are not psychologically sound and have some type of mental illness. Even so, this does NOT make what they did "okay." It might make it easier to understand how a human being could do such a thing, but it is not an excuse.
As a side note, pedophilia is a recognized mental illness, and I haven't seen anyone get let off for molesting or raping a child because of it. Thank God.
Although I personally cannot fathom how a human could rape or murder without being completely out of their mind, there are people out there who commit these crimes and do not meet the criteria for mental illness. They are just as "violent and disgusting" as the rapists and murderers who are mentally ill, they just don't happen to have a mental illness of their own.

Yes. It is possible and in fact I would say thats the case for the vast majority of people. Studies suggest that a large portion of people in jails have something called antisocial personality disorder. This is a personality type-one that has no remorse or respect for the rights of others-and not a mental illness. They are entirely responsible for their actions.

Having mental illness does not mean someone isn't responsible for their actions, at least generally speaking. There are some cases where people can be psychotic, which means they have lost touch with reality and sometimes have delusions or hallucinations, and they can be considered innocent by reason of insanity. In those cases, the individual is too ill to realize that their actions are wrong. You see cases like this every so often with mother's who have postpartum psychosis. I can recall one case in which a woman was so ill she thought that the devil was coming after her children. She subsequently killed them but it was because she truly believed that she was protecting them from demonic possession or injury. Once she was treated and was able to grasp reality again, she was inconsolable. This woman will be punished throughout her life because she will have to live with the fact that she killed her children. Many people with psychosis are so ill that they can never get back into touch with reality.

Anyway, the short answer to your question is that yes and that the vast majority of criminals commit crimes for reasons that have absolutely nothing to do with a mental illness.

Anybody accused of murder or rape will use any excuse real or not to get out of trouble. Mental illness is easier to fake or make believable. Few murders and rapist are mentally ill and few mentally ill people are murders and rapist.

there is sometimes a history of a mental illness of people WHO commit violent acts . however, not always .
it is not an excuse for murder or rape . It is up to the criminal justice system to figure out what makes a person tick .It is not easy .
if a person is found to be legally insane then they go to a hospital for the criminally insane.

Not always, but it's pretty common for people in prison to have mental health disorders. Also, it's not unusual for lawyers to claim some kind of mental disorder in trying to get their clients a lighter sentence or to have them declared "not guilty by reason of insanity." However, a lot of criminals have well-documented mental disorders and they are found guilty anyway (they have to prove they couldn't tell the difference between right and wrong).

There is a mental disorder called Antisocial Personality Disorder where someone breaks the law and has no regard for the feelings of others; a large number of criminals have that disorder or at least they have some features of it without having the full disorder. I don't think anybody ever got special treatment in prison for having that disorder unless they had another disorder as well--such as schizophrenia or bipolar disorder.

I used to work in a mental hospital where guys in jail would be sent for evaluations, most of them were judged to have no mental disorder and were sent back to jail. I also worked for a prison for a little while; we had a lot of prisoners who were being treated by a psychiatrist, some prisoners were mentally retarded.

Yes, I think someone could be antisocial and their behavior is completely related to getting their needs met without any consideration of others.