Defensive VS offensive weapons is an interesting point.
One might consider the old mantra of what the “the best offense is…”
I don’t want to get into a deep discussion on this as many of those weapons, can and have been used as defense. Most basic examples of explosives is mines/IED’s. If the government was coming to take over your house, mines would make a great defense against vehicles and personnel. Arguably one of the most effective ones.
I’m curious on your point where you aren’t OK with them owning guns, yet you aren’t OK with actually going through and weeding them out.