NPC problem

I re-installed Gmod just a day ago, and I was very exicited to be able the play again, but when I wanted to create one of those huge fights between combine and rebel npcs, the rebels wouldnt shoot back. i also tried the “citizen” and “refugee” npcs, but they didnt shoot back either. the antlions and zombies still fight, but im puzzled as to why the the rebels are the only ones who wont fight.

oh, and by the way, i cant turn off god mode, i un-check the box in admin settings but i still wont die.