Don't let the critical comments get to you. I know the feeling (http://www.texaschlforum.com/viewtopic.php?f=7&t=28509), but I'm pretty sure everyone here is trying to be helpful (for the most part). Keep in mind that they don't have all the info on the situation, your background, taken the generation gap into account, nor do they know exactly what your mind had been dwelling on just moments before. Just as reading the story where a LEO had to shoot a BG almost 50 times before he went down would make me worried to only have a 5 shot revolver in the linked situation, so any number of parking lot stories could have flickered in the back of your mind the second the guys came into view.
Forgive the people who don't bother to read your follow up posts that explain things. It's just a fact of forums. Explaining that the kid had his hand on his knife for the third time because I forgot to include it in the original post... yeah, lesson learned.
You made it through with no ill effects, and only one DVD, so I think you did well. Also, you would have been in a MUCH better position to defend yourself than the naysayers here had the well dressed guys intended harm (come on, BGs use KIDS as props these days, why not Mormons?) For all you knew at the time, their friend was sneaking up behind you with a baseball bat.