There's a debate over confinement for rehabilitation vs. punishment. People like this transcend that argument. They should be confined so they can be carefully studied, like someone with a rare contagious infection.

Fulfer said that in the months after the attack, she received hate mail and began to worry about possibly being targeted again. She began to imagine ways she could use everyday items like her laptop and metal water bottle to defend herself.

-- https://www.cbc.ca/news/canada/kitchener-waterloo/villelba-aleman-sentencing-day-one-waterloo-1.7359257

(Fulfer was the professor and one of the three stabbed.)