'Kill' is not vulgar. Vulgar language would be cussing. And the "I am going to kill you' example was so that you would GET THE POINT.
And in the F5000, in the 'Minigun Races', Pilots actually got KILLED.

Also, we aren't making this game for 5-year-olds, we don't need to limit ourselfs with 5-year old language. Obviously, we should avoid cuss words, but not avoid EVERY word in the English language.