Brandon Wright
I may not be fast, but I'm wide!
Rosberg is trying to do what Hamilton has become quite good at but he's yet to learn how to pull it off. Yeah technically he's at fault, but to me he's more at fault for not knowing when and how to pick his battles and maybe even more for not being a popular world champion.
That's pretty much how I see it (or trying to do what fellow German Schumacher was the master of), Nico just doesn't seem to have the finesse to balance that fine line between a "hard racing move" and sloppy chop move, unlike Lewis who seems to be quite adept at it.
If Nico hadn't locked up maybe he could have turned without contact, and kept Lewis wide and forced to back off.
Nico didn't lock up, at least not visibly. Skip to about 2:15 in this video, there's no tire smoke, Nico was decelerating at pretty much the same rate as Lewis (so his brakes were working to some extent) but he forgets to turn in until he's almost past the apex.