Firstly I’m not sure what you mean by ‘it seemed to work’.
Terrorists with toy guns should be shot?
Terrorist who pretend to be polite members of a society should be allowed to buy guns?
Next, what is your evidence that ‘an armed society is a polite society’?
Afghanistan is a fully armed society. Are they polite?
The UK has rigorous gun control (e.g. virtually no handguns; no guns for home protection; beat police are not armed). We’re still pretty polite.
Well, yeah, I think it’s a stretch to call this a copycat crime. But I’m all for the deadly force used to defend themselves and their school, whether the terrorists were armed or not.
As long as they look like real ones, yes. If you’re trying to make someone think you have a real gun, you shouldn’t be surprised when they react as if you do.