That is very wrong. We shouldn't be drawing the line to kill someone for public and private property. We'll need to establish harmful intent and threat to life as the line where people get to defend themselves and decide if they need to take a life. Stepping onto your lawn is trespassing. Well, if a stranger had a weapon on them, then they have already let their intentions known and they can be put down. But, if what you say applies, then absolutely anyone can be killed when they trespass, however harmless it was. Even a delivery guy can be shot technically.
An Amazon package isn't worth killing someone over. But it is worth it, if someone is armed and is threatening your life.