Like I pointed out in my first post, all sides in this are guilty of being selfish. The fact is you are calling out the selfishness of some while excusing the selfishness of others. Everyone is in it for their own goals. My stance this entire time is that people will be selfish. The most you can do is hope that your goals align. And, like I detailed in my first post, the current roulette system doesn't exactly help ensure that your goals will align.
And within this topic, there are numerous other issues people have brought up that fit with this idea. Eating while doing a dungeon run and thus not playing optimally? How exactly is it not selfish to expect others to accommodate that? But, at the end of the day, if you want to express that selfishness, you are fully within your rights to do so. All I am saying is that the other party members are equally entitled to express their selfishness and kick you or drop the duty.
You call it childish. I'd say the mature approach is to take things in stride, understand the give-and-take of social interactions rather than being a judgemental and over-righteous SJW, and not get caught up in the blame and shame game.
As for your other examples, they're not worth addressing as they're just as hysterically inaccurate as your older ones. The sooner you expand your perspective, the sooner you will realize how flawed they are. When I have a falling out with someone, my first reaction is not to call them a sack of selfish, childish crap. It's to understand that our paths simply couldn't align.
As for your final point, the basis is flawed. People queue into DF for various reasons. To assume you are the judge of everything and everyone is beyond presumptuous. But, given your holier than thou posting history, it's not surprising that you are on that high-horse. Take the Castrums for example. Some are in there to actually experience the story. Some are in there to just progress their MSQ. Some are in there to farm tomestones. The different groups have conflicting goals. At the end of the day, all you can hope and expect is for the people who want a fast run to push for a fast run in their own way while the people who want to enjoy the story can hopefully do that. If a cut-scene gets skipped due to clearing too fast, that's too bad. If your run is not as fast as you want because a few people are watching cutscenes, that's too bad. If you can't deal with it, make your own group of individuals with shared goals.
The only thing guaranteed about a DF queue is that nothing is guaranteed outside of your ability to leave with a 30 minute penalty. You are trying to twist that FACT for the sake of argument. If you don't want to deal with a tank leaving, queue as a tank or find a tank who is willing to stay and queue with them.
You are quite literally blasting leavers for not wanting to deal with RNG and then turning around to defend people who don't want to deal with the RNG of getting a tank who leaves. They are all a part of the RNG that is DF.