I think in the short term we're kinda fucked. But in the long term I would like if we tried to make these crimes not happen. Find out why they're happening.

Can we help these criminals before they become criminals essentially?

And I wasn't saying we should get rid of prison, rather allow the person to choose death if they wish.

I'd also like to see if we can actually slowly introduce them back to society, slowly give more freedoms back or help them take jobs that gives their life meaning.

It's a hard problem and we definitely don't have the correct solution right now.

The person already suggested an alternative: execution.

That’s what human societies did for those crimes for thousands of years after all. The replacement of execution with prison is relatively modern, pre-industrial societies couldn’t afford to run prisons and punished using capital punishment, slavery, or exile instead.

(Of course we did switch for a reason, prison was thought to be more humane than the above)