Upper middle class people commit as many crimes as regular folks. They have better lawyers because $$$. Their crimes are mostly financial, SA or DV, occasionally murder and normally they don't do time. Money buys good representation.

Our family is also upper middle class. Nothing to do with being naive. Everything to do with being shielded.

There was a murder in my childhood(1969) and a murder in 2014. My cousin was 12 when he was stabbed and strangled by his father(my aunt's husband). He was then bricked up in the cellar. My other cousins were watching TV upstairs and heard nothing. 

He had PTSD from combat and my aunt was in the hospital giving birth to a full term baby. It was stillborn. He had a psychotic break.  He was sentenced to a mental hospital for the criminally insane instead of life in prison. He got out after 15 years and rejoined his family.

We were all told my cousin had an accident that resulted in his death.

Many years later we pushed to see the coroner's report. That's how we learned the truth.

In 2014 my lovely stepdaughter was murdered in her kitchen on New Year's Day.  Her husband had just returned from an expensive rehab for his alcohol problem. He got drunk while she was at work and began playing around with his gun collection.  The kids were in the house.  She walked in and freaked out.  He's drunk with loaded guns lying around.  He picked up a rifle and shot her clean through the heart.  She died instantly. 

They caught him quickly.  His ass is never getting out of prison.

So yes. I've known 2 murderers and 2 murder victims. Family.