Its not easy. Its easy for a certain amount of people, in some situation.

And just because its not easy doesn't mean there needs to be no law. No law means no conviction. There is no 'common sense law' which allows the state to put you in prision because its obvious that using some weapon in an unsave way is illegal.

And yes sometimes society adds protection to normal people so that they don't do stupd things. Plenty of 'smart' people allow others to get killed due to neglect, stupidity etc.

Btw. i'm pretty sure that having easy and quick access to a weapon is also a danger in itself. Sometimes you just need a little bit time of cooling down or talking to someone.