What causes people that believe in Islam to become crazy and violent?

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I ask this question because my stupid left-wing sister who converted a couple years ago went completely fucking psycho, called the police yesterday, and lied to them saying that I threatened to an hero with a bottle of pills. Now I never even said that shit, my dad who was here on Sunday vouched for that, and my mom who was also here did the same.

So two cops come, they come in my room while I was trying to chill and shit and I had no clue anyone called anyone. They're like "hey dude, you alright? we got called because they said you're trying to hurt yourself and made a threat yesterday about taking a bottle of pills and ending it all or something". So I asked them who told them I said that and they lied to me and said "your mother said it".

Now my mom never said that shit at all. My lying bitch of a sister with the rag on her head said it which prompted them to come out, ask me all kinds of questions, bring out a mobile crisis unit of two women (who were cool as shit cause I've dealt with those kinds of people before. I just despise cops though) and they did a quick evaluation and said "you're fine".

My sister gets her shit and leaves, the cops leave and I thought that was the end of it. Hours later, another cop comes to "check on my mother" because she didn't answer the phone when that lying slut called her.

So my question is: what the fuck is wrong with those who believe in Islam? Are they just retarded or psycho? Or both?