I honestly can’t tell if this is sarcasm or if you have reading comprehension problems.

I wasn’t home. There was no possibility for me to prevent this theft, gun or no gun.

If it’s sarcasm meant to show that things can happen even when armed, no shit. If that is meant to show I shouldn’t have one at all, would the counterfactual (situations in which a theft or assault were stopped or prevented) be sufficient to show one should carry?

You sound like a thief who’s mad.

If stopping someone in the act of stealing my shit or trying to harm me is vigilantism, then sure.