@LikeASkurn
Killing someone for being annoying or for causing an inconvenience is the path of a two-bit villain or an edgelord.
Being stupid, selfish, and incompetent doesn't mean they deserve to die. We technically haven't actually seen them commit any heinous crimes worthy of death. Blondie's friendly fire should
definitely have consequences. What those consequences would be where revival apparently exists is up for debate.
A
legitimate reason to kill them is what AFresherPerspective said above. The "heroes" are dumb enough to keep trying to kill the MC. If he keeps letting them go, then they just have to get lucky one time. Even if they don't ever beat him, there always the chance that they'll recognize him at some point. He's holding some of his abilities back specifically so they don't figure out it's him and go after his parents. The best way to protect himself
and his family is to remove the greatest threat to himself.
Too bad we all already know that's not going to happen.