James Wilder:
James shook his head as he listened to Maddox, part of the him wanted to shoot the drunk fellow and go after Carter without him.
Aside from 100% justifying Maddox's distrust...he
just offered to give James non-interactive help/told him to bugger off on his own.
Like, he's not stopping James
not enlisting his help, James is just a lot more likely to find Carter with the local bounty hunter not actively hostile to him. Apologising for/explaining letting Carter go rather than helping Maddox capture him, or even just for rolling up like nothing happened and demanding he share his local knowledge would probably help, y'know. NPCs don't know they're NPCs, after all.