[This is why you don't murder people, Newt.]

What, that he has nefarious intentions and wants us all to murder one another? He's a neutral party in this Game. He's not on our side or against it.

I doubt he personally went, "Newton wants to kill a Reaper, so I'm going to help him." In the same vein, though, he wouldn't have gone, "Newton wants to kill a Reaper, so I have to screw him over."