I'll do my best to give soundbites, if that helps, Nerf.
You are right, of course, about Roux.
I suppose my bias is thus; it's Roux's job to do the best he can for Oscar, and it's Nel's job to do the best he can for Reeva. I'm always going to be on the side of the person who took the bullets over the person who pulled the trigger.
I'm not without sway - if there are genuinely extenuating circumstances '(s)he was about to kill my child/parter,' or so forth, I can see why a trigger would be pulled. In this circumstance, I can see how it may have been a tragic accident. But a little voice always follows that with 'a tragic accident that was only possible because he had guns, and when instantly for a gun rather than any other form of resolving the situation'.
I agree it is my personal bias on hating guns that makes my starting position 'the person who pulled the trigger is responsible'.
(To be fair to me, I really love watching target shooting, trick shots, competitive markmanship. But I can't get excited about the things themselves like, for example, my husband can. He's not a gun nut and would never own a gun, but he can appreciate the machine beyond the use of it. I start off by thinking they're vile things.)
Just to explain my bias a bit.