By pointing to CA-compliant mags as having reduced the damage Rodger did, you're effectively asserting that gun control works. It doesn't. This guy could have had 33-round mags for his Glock, and it wouldn't have made a significant difference. What would have made a significant difference is if there had been armed citizens in the immediate area who had confronted Rodger at an earlier point. That's theory, of course, but it's based on sound logic and common sense.
California may have saved a life or two by enforcing a 10-round mag law, but they could have saved countless others by giving law abiding citizens the right to defend themselves with the best protection our society has to offer. A 10-round mag law is about on par with, "You're still going to die, but we'll buy you some time." Gee, thanks.
Bingo.