What makes certain teens still think they can commit a horrible crime and get away with it?

I've been listening to a couple cases where a teen callously kills someone and then either thinks it's funny or claims they won't take any responsibility for it. Then they have the nerve to still demand to be treated like a juvenile.

Aren't they aware the youngest child to be given a life sentence in the US was 12 years old? This country is already known to sentence 12 and 13 year-old rapists or murderers as adults. They haven't gone anything lower than 12 though. The only young murderers that got away with it (judged as minors and sentenced to detention center, than released at age 21) were between ages 9-11 years old. So why would those teen (past age 12) still think they could get away with it? Then they act shocked when they get judged and sentenced as adults to either a life-sentence or a long prison time.

Updates
11 mo
Aren't they aware of the Lionel Tate case? He was 12 and initially got the sentenced to life in prison without parole; the youngest kid to get a sentence like that.
What makes certain teens still think they can commit a horrible crime and get away with it?
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