Right, but Sanders didn't endorse Perez for a reason (lobbyist donations). So your argument is something like: if the universe was totally different, the universe would be totally different. Which is like: no shit, cool. In this real world, Ellison was the candidate less favourable to corporate influence. That made him the candidate for the grassroots. That just got ignored.
Also, I'm fine with doing work. I do party work all the time. I ruined my best shoes campaigning in Stoke the other week when it was pissing down, and I've never voted for Corbyn and don't live in Stoke. It's still pretty reasonable to point out that not everyone is as functionally utilitarian as I am, and sometimes they need to feel inspired, and accordingly that this was a dumb move, while also wanting to do work.