I don't believe it is normal. I am higher functioning, but my cousin who is lower function doesn't do this. He may hit you though if you try to do something to him though (touch him, take away his iPad, etc.), but not randomly. And not sexually.

But in the law, if the person can not understand the wrongness for what they are doing, they can't be charged with the crime. Here is a link to an article (about Canada though):

What does 'not criminally responsible' really mean? - Canada - CBC News

Basically, at least here in Canada, if you are found guilty of a crime, but can't be deemed criminally responsible due to mental disorder, then you can be sent to a hospital for treatment, and be given conditions to live in the community. You can be sent to a treatment facility. But this may be for conditions for people with conditions that are treatable with medication. There are some medications to treat aggression in autism. Some APs.

I hope this helps a bit.