In 2007, I caused a multi-car pile up and drove away.
Why did you drive away?
I left to hide it from my family.
Many people will cause an accident while driving at some point in their life so that's not a big issue. The issue is that you fled from the scene. Those people were left with no recourse for the damages you caused because you ran away and were scared of taking responsibility.
They shouldn't blame me. My insurance covered the cost of everything.
Even if your insurance covered it, you still broke the law. You can't leave the scene of an accident.