Solved
Forced to Murder When Given Other Options
Spoiler warning up front for Noveria and Garrus' loyalty mission in ME1. I'm unsure if this was an issue before, but at least since the latest patch whenever I've been in combat situations that can ...
That Noveria situation is the same as it has always been. There's no way to resolve it peacefully even if you use a persuasion option. I don't know if that was a bug in the original or always intended to be that way.
Edit: I did some googling and apparently the persuasion check prevents additional drones from joining the fight.
