To be fair, it does seem to be in Medic's personality to behave this way. I mean he is of the TF2 universe after all.
However yeah Ridley won't enjoy the overly aggressive maneuver, especially when things could be negotiated. But he's also realist, there's no way the Red Queen nor the C Virus would be given for free. So conflict was bound to happen.
As for fodderizing. Well the soldier NPC's in Resident Evil are quite lackluster next to the Multiverse standards so it's only normal that they get ass raped. Plus they're not killing innocents who didn't ask for anything, they're associated with Umbrella (Or Neo). If anything, UMMA should kill them off too.
The BOW's however are going to kill most of the soldiers quite easily, leaving the main protagonists of the invasion the freedom of elaborating whatever they want. I trust CourierSix will find great monsters for you all to play around with.
I'll wait for Flamelord to post as Cinder Fall. If in a few hours it isn't done I'll just post with Ridley.