The reactionary in me thinks "life in solidarity confinement without the chance of parole."
The me in me says he needs a long time in some sort of rehabilitation program. As much of a monster as he is, he's a bit of a victim. May he be studied so that we can pinpoint and prevent others from following his path.
They are so much better at this stuff in other developed countries. The US prison system is all about punishment where others focus a lot more on rehabilitation and prevention.
(Not so) fun fact: The US has 5 percent of the world's population and 25 percent of the world's prison population.
The United States system has financial incentives for low police/prevention and long harsh prison sentences, due to cities paying for police but counties/state paying for prisons. Cities can cut taxes and police and pass the cost onto the county or state.
Ideally you'd want quick guaranteed consequences for breaking the law. We have the complete opposite, and when we do catch you, we impose a huge penalty to make up for all times we probably didnt catch you before.
Guy kills ten black people and Lemmy comments are all 'yeah but death sentence and prison are wrong, maybe we should get him a nice job and somewhere to live, I'll pop round to massage his feet once a week...'
Maybe the death sentence would be the better option than prison. Not like we are on par with other peers with prisons. Either way I could care less about this one specific case.