The latest mass murder was not caused by a lack of morals on the part of the killer. It was because he was insane. There are many insane people freely walking our streets due to the leftist belief that it is unfair to lock them up as was done in the not-too-distant past. Most of the homeless are insane.
The insane, and they usually are well known beforehand, need to be locked up again. For their safety and for everybody else's.