One is easy an people don't do it, while one is complicated and people don't do it.
You could drop stuff from a drone or have a drone shoot a gun too, but people don't want to hurt other people in general.
What scenario is in your head that you think being able to drop something and hurt or kill someone is going to happen more if people can do it automatically?
Who are these people that aren't hurting anyone but are suddenly going to do it once it becomes a science project?
There is no evidence or explanation here, you seem to just be saying that if people can hurt other people with some sort of automation they will, but you're not explaining why that would be or giving any examples of it happening.
You could drop stuff from a drone or have a drone shoot a gun too, but people don't want to hurt other people in general.
What scenario is in your head that you think being able to drop something and hurt or kill someone is going to happen more if people can do it automatically?
Who are these people that aren't hurting anyone but are suddenly going to do it once it becomes a science project?