If you get a dog, please also get a higher quality video camera - those photos suck. I want to see detail when the dog does it's thing
Personally, I am surprised at your self control but in these days, who knows what some crackpot will do when you come out ready to tackle him - I've had a gun in my face in a street fight once and I did not enjoy that moment of "oops, didn't plan on that" so I just held my ground but made no more advance seeing as I had fought my way in and pulled my friend to safety by then ( a friend and I had been jumped by 7-10 guys, very low life stuff not common in the area we were in)
Anyway, you never know what it could turn into. You should not walk out with a gun unless you are in fact prepared in that exact moment to finish. You may even scare someone into escalation - and be caught off guard and shot yourself if are only bluffing.
Too bad you don't want dogs, an invisible fence would be awesome. I don't believe in any sort of tether on a dog because it actually puts them at risk and less able to defend their own self if someone gets really nasty. Three dogs would be better though....