Carapaz went early, but Del Toro is almost forced to follow then. If he doesn't, what happens? He's in the second group, Majka and co pull him up, but Carapaz is now 30" ahead. Now 40". Majka as amazing he is, considering how long he's been around, can't keep Carapaz within easily catchable distance. So ok, Simon Yates goes, then Del Toro follows. Yates will not pull him up. Etc etc. In front Carapaz can just ride his tempo, in the back Del Toro is in a similar situation to the front, people don't want to pull him up... he doesn't follow he risks losing the Giro then and there.
At some point Del Toro should have taken the risk and ride. And no, this I don't blame on UAE, he has to be able to make his own decisions. Yes, he goes, Carapaz attacks him again very soon, that's the risk. Better fight and lose than lose without fighting.
After the Finestre was embarrassing. Ok, he might have been completely empty, still.. he wasn't going to lose 40" and second place to Carapaz, rosa was most likely gone, but still, try, fight, maybe Simon gets a flat, whatever. Just try.
UAE is of course to blame for letting Van Aert up there. But IMO not for the way Del Toro then rode. Keep Carapaz wheel ok, even if that was the order, he has to realize that it's slipping away.
The sprint at the end then was just an insult to cycling fans, if you don't have the common sense to fight till the end, at least spare us the sorry sight of that sprint!