Some don't want work, other are unable, also education will need. Some people just want to break heads. They are not in good condition. Next theme is the self-defence. Everyone has the right to protect and defend themselves.
Some legal systems seem to try to prevent the use of that right.
Those systems should be changed. Truth is, that there are many weak and ashamed persons out there, who for some idiotic reasons to attack others, often easy targets such as old people. Maybe this kind of people would come to kill. This kind of the situation could compare the war. The war's one result is the death.