If you're an arrogant fuck, I'm likely to put a bullet in your head, even if you're on my team.
If you're impeding my progress, I'm likely to put a bullet in your head, even if you're on my team.
If I'm drunk, I'm unfortunately likely to put a bullet in your head, even if you're on my team.
If you're a 13 year old with an incredibly piercing, high pitched voice that interchanges every second word with either "Fuck", or "******", then I will put a bullet in your head, even if you're on my team.
Those are my excuses.