This was all pre-John Connor meet-up though. Later, when he grabbed John by the collar and the two guys working on their car came over to help, the T-800 was about to point blank shoot them in the head. Then Uncle Bob got the whole "you can't just go around killing people" lecture and subsequent order not to kill anyone.
Exactly. That's my point. He wasn't a kind gentle terminator trying to minimize harm in the biker bar. Cameron just had a series of fortunate flukes allow the bikers to survive in order to not create the moral quandry that the "good guy" was a murderer at the beginning of the movie.