I think Pozzo summed it up the best:
“There was a moment of slowing but then there was the hill to climb,” Domenico Pozzovivo (Ag2r-La Mondiale) said while coughing and catching his breath in the high Alpine mountains."
"It wouldn’t have been possible for them to wait until he returned, the race was that climb in the end, if we didn’t make the final climb hard, then there’s no show.”
http://www.cyclingweekly.com/news/racing/giro-ditalia/the-race-was-on-we-couldnt-wait-for-him-say-tom-dumoulins-giro-ditalia-rivals-332303
Like he said "then there's no show." For those calling out the other riders for not showing more respect . . . what about respect for fans who waited on the roadside? How respect for viewers like us who had this date circled on the calendar for months? What about rider's respecting their obligations to work (under contract, mind you) for their team owner/sponsor?
The riders are indeed warriors, but they are not Chariots-of-Fire amateurs. Part of their job is entertainment. Part of their job is to represent their sponsor, best done with their logo on the shirt of the stage winner.
If the leaders waited any longer, Landa would have won in a solo. We would have been cheated out of the exciting chase and capture on the decent. What about Bahrain-Merida? I guess they win so often that they would be happy to cede a stage victory in the queen stage of the 100th Giro, just because a guy had to take a dump?
And finally, if they had soft-pedaled at 10 kph till Tom caught up, then what? Is Dumoulin then bound to not attack since they waited for him? If he does, then cries of unfair! start again. Once Dumoulin stopped, right there at the base of the ascent, the stage was screwed up. Fortunately, we still got a good show and drama at the end.