I'd like to know more too. Steve Yegge gave a data point about SREs in his recent liberal/conservative software rant: he said SREs are extremely conservative, and that he finds it normal given their duties. So it follows it's not a good position for a liberal dev.
It certainly would seem logical that an SRE would be software conservative.
I seem to be a macro liberal who holds specific conservative positions. Perhaps not surprisingly, a friend and fellow engineer who I believe I've done some of my best work with would seem to be a complimentary opposite.