I don't remember killing any people that weren't going to be killed regardless. Most of the situations where you can talk a guy down you can do it through Renegade path too, just through intimidation/insults rather than diplomacy, so it's not like he'll usually shoot a guy that you could've otherwise not shot very often at all (and I don't ever recall him shooting someone that could be considered an innocent bystander). Most of the time if you pick the fight option when you can try and talk it out it's neutral not Renegade.
I don't know maybe I'm forgetting stuff. All I'm saying is I never really felt "evil" as Shepard just like a guy who was doing his job, had a bad attitude, and didn't take ****.
--
No problem!
This is a cute and pop genocide of love!