American Prisons have this funny thing called prison labor - they pay offenders vastly lower than minimum wage and make them work on public works, various constructions, factory work, maybe even some mining or some such.
That is the best way to treat guys like cammy and the various incels and their leaders like Larson. I would like to see 20 hour work days for them - give them maybe 2 or 3 hours of sleep, after all, their health is not a concern.
They've made their domestic terrorist leanings thoroughly obvious, so bringing them in would be utterly no problem.
Everyone wins - the more productive portions of society get to see their infrastructure built up, productivity and factory work is completed, and incels get to have sex. In the prison showers. Not the most consensual sex, but then, incels are pretty okay with rape in general.
I would call it the Country Beautification Operation.