I'm not even remotely suggesting that wipes happen because the healer is doing it on purpose - I'm suggesting that YOU cause wipes becuase YOU are causing them on purpose. You admitted to explicitly that in your own post, which I quoted. You are timing things to deliberately kill the tank. YOU are breaking the run, not the tank, because you feel the tank needs to be "taught a lesson".
I have never had a healer deliberately try to kill me to prove a point - or if they have tried, they have failed so badly that I did not even notice the attempt. This is your own personal quirk, and thankfully the vast majority of healers are better than that. I'd imagine that many healers who would ordinarily side with you against speedruns are shaking their heads, thinking, "No, NyarukoW, please just stop talking and making us look like jerks!"
I've never seen these rampant wipes you're so sure are bound to happen, even when I speedrun with newbies or folks with less than top-notch gear. As I said: Players in this game are BETTER than you give them credit for. They can adapt and succeed, even when you push the envelope.BTW the speed run itself is not the problem. The problem is the speed runner. The assumptions that the speed runner makes is just plain wrong and the evidence is plain obvious from all the wipes it has caused and continue to cause. In addition the speed runners will verbally abuse the new players and force 1st-timers to skip cutscenes and that is just not the best way to do things. There is no shame in going slower or at least taking, heck 10 minutes (massive exaggeration, more like 60 secs) to communicate if you must.
I have also never witnessed a tank browbeat players for wiping to a speedrun, on the occasions when I've played as healer or DPS. Tanks, just like all players, are mostly good people, in spite of what cynics would have you believe.
You say there is no shame in going slower. This is true. There is also no shame in trying a speedrun, then wiping, then taking things easy from then on (though on the rare occasion that this happens to me, the healer usually speaks up and encourages me to try again - that they've GOT this, this time, and I don't need to slow down for their benefit).