This is actually the quest I finished myself last night, though I opted to murder Roy and his wife in their sleep. At this point I was also a resident of the Tower, and decided that in the Wasteland you take what you can get and defend it to the bitter end.

The only thing you failed to mention is that this whole quest is a complete rip-off (or homage if you're a dick) to Romero's 'Land of the Dead', which is a much better movie than you or Joel give credit to.