>I hear most people on the left support reforming criminals, and finding underlying root-causes. Do you?

I do, for root-causes such as poverty, lack of economic opportunity, lack of education, being victims of racist policies, etc... sure, reform is possible.

When the root causes are massive delusion, indulging in ridiculous conspiracy theories, general resentment that other people want to be treated fairly, cult-of-personality-like worship of a dictator, etc. Then unfortunately the root-cause is ignorance and the problem is unfixable.