Yes, never been a fan of Nibali and he has form for this as well - 2015 TdF, stage 19, as well as the infamous "motor pacing" incident in that year's Vuelta. Quintana strikes me as someone who is more of a follower rather than a leader but he really should have had the moral courage to do something especially after his crash the other day. You can argue that in modern racing that is commercially driven then mechanicals, accidents, whatever, should just be accepted and taken on the chin and that probably seems like a good idea until you are the one standing at the side of the road with a flat tyre.
Hopefully the karma police will be along in a day or so.