I'm with you on how to handle people with chronic mental illness that just aren't safe to be in society. But "nuthouses" cost $$$$ and we stopped wanting to fund that a long time ago. There are probably meds that would settle this guy down, but they have side effects and patients refuse to take them. They are "free" and "have rights" so they walk around insane.
Since the Hinckley attempted assassination of Ronald Reagan the consensus has been to simply jail the crazies as criminals when they do criminal things. This guy was let out after 8 felonies, and being here illegally. This is plainly wrong. He should at least be in jail and then deported ASAP. I actually would totally support quick trial and execution of these types who will never behave right -- which is probably true of most violent criminals.
Nearly all the blacks who were the subject of big BLM marches and riots after they were killed by police were doing some outrageous crime at the time. The idea of BLM is that blacks should get to freely do crimes. I sure wish this guy had been slower and the cop faster.