Crimmigrant.
Mental illness is a huge problem.
Especially schizophrenia.
Many mass shooters has been schizophrenics.
What I understand, these people thing that somebody/everybody is after them, and they just defend themselves.
They are really not responsible for their actions, but they are left roaming the streets.
Humanly insane asylum should be the solution, but so often it is not. All kind of laws prevent sick people to be involuntarily constrained!