You want to leave the plane if you can’t get a seat you find acceptable? Fine, but get there early enough so you don’t cause a delay. I have absolutely no problem with that.
It seems to me (based on the article I read) that even according to the version which doesn’t claim the airline was scapegoating the chareidi passengers, the delay wasn’t the passengers request, it was the airline’s getting their luggage off.
Why should this be different?
Because now you’re asking someone else to pay. Also, it’s not a question of paying more for a chumrah; they got off the plane.