So last night when I try and go back into the strip the NCR goes ape [censored] on me. I don't understand why though, I am accepted by those [censored]es. Then they come up with their clubs and be me up! What is going on here? Is it some kind of bug? I gotta stop smoking before I play this game because I always kill a bunch of random people then forget what I'm doing then save like an idiot haha, but really I don't think I have messed up, but maybe I have. I guess we can all learn something from this, and that is don't smoke and play Fallout!

I remember I had to accidentally mow down several NCR troopers and a Crimson Caravan trader at Camp McCarran after fast traveling... It took me awhile to figure it out, but I was wearing BoS power armor instead of the T45d suit they'd given me. Turns out the NCR aren't too fond of the Brotherhood.

yeah, check what you're wearing. I've walked into NCR camps with legion armor on many times before, going crazy is a typical NCR reaction to this

You should have shown them your autographed President Tandy Limited additon Trading Cards.....then, they would have said you were ok. Of course, that is hard to do when they are already shooting at you. Of course, if there was such an item in the game, the gum would still be good.

Check your armor first. Then check your rep within the New Vegas area. I know that killing folks in casinos can lower your rep, but I think that's specifically with regard to civies you may accidentally mow down.