I would introduce myself and get to know them. Even if they are gang bangers, I would rather be cool with them then not be. Just my .02
Would there be anything to gain by going out that night and confronting who ever was out there that night?
i believe the going out side armed to confront the taggers only can lead to bad things,you could get hurt,or you might shoot someone and end up being sued,plus there is no reason to let anyone know you have guns,might come home and find you were robbed