Unarmed NCR troops try to start fighting me. If I fight back then the Securitrons come down on me like a ton of bricks, so instead I stand around gormlessly and watch my companions run around beating the NCR infidels to death, chasing across all three sections down to the last man. The Securitrons are fine with this, they don't bat an eyelid, even if (as sometimes happens) a random gambler or hoker is caught in the crossfire. This little performance happens every single time I visit the Strip, and although it was quite amusing the first time the novelty has worn off and it's rather tedious now.
Isn't the Strip supposed to be a kind of neutral zone? House doesn't let the NCR carry weapons, and law enforcement is the responsibilty of his robots. The girl at Vault 21 talks about having Legion peeps as well as NCR at her hotel, and Vulpes comes to find the player on the Strip. Legion and NCR personnel. it is implied, co-exist peacefully (if uneasily) on the Strip. Why do the NCR not extend the courtesy to me? I've no objection to being attacked on sight in NCR territory, but the Strip is not NCR territory. Why aren't the Securitrons coming down on the NCR goons who attack me first? They're the ones in breach of the peace, not me. I don't know what I'd do if I couldn't rely on my own coterie of invisible-to-the-law bodyguards.