Only when they display such willful ignorance. I'll pretend you have an open mind about this and break it down for you. I know you don't, but since we're pretending...
First, almost every guns sole purpose is to kill something, with the exclusion of competition target shooting. How does that apply to semi-automatic weapons exclusively? It doesn't. So basically you're making an argument for banning all weapons.
Second, "spread as many bullets of death as possible" applies to automatic weapons, not semi-automatic. So basically you're trying to drum fear. While we're on that...
Third, "bullets of death". Really? I think I'll just leave that one on the table. You could have thrown in a "someone think of the children" while you were at it.
Fourth, "wondering why they are called evil?...". Inanimate objects don't have a moral compass. Guns don't kill people, people kill people.
Finally, if the goal is to limit "evil" and you think that going after weapons is a viable route to that (hint: that's an extremely debatable subject in the first place), why wouldn't you limit the "most evil" weapons which kill the most people??? Oh, that's right, we disregarded logic a long time ago.
Ergo, you're an idiot.
QED