Uhh... yeah, there's a double standard. I've reaffirmed it myself in what I said and have never stated otherwise. What seems like defending bad players is actually a reason why things are how they are. You keep ignoring that though, I guess because I'm not literally saying that, word for word, like I just did now. I'm pointing out to you the reason the double standard exists (and will ALWAYS exist in the current setup of this game) and why merely adding a parser is not going to change a single meaningful thing. The tank/heal/dps exclusive setup will always put the spotlight on tanks and healers WAY more than DPS will ever see, as far as accountability goes. That is simply how we respond to the holy trinity setup (namely because its singling out a minimal number of players to fulfill an important role). Why basic design concept and the psychology behind how we treat it is difficult to grasp is beyond me... actually, it's not. It's expected on the internet lol.
Believe me, a parser is not going to suddenly change the majority of bad dps into decent ones. A handful, sure, but you'll still come across bad ones at nearly the same frequency. It's the nature of modern MMORPGs. They also won't suddenly be excellent DPS during your run as well. If they're not willing to put in the effort to begin with, which is honestly the more common case (i.e. not giving a damn to "learn" their rotations/priorities or they're just being lazy in their i130 gear), they won't care what you say even if you single them out. Calm down and clear your mind a bit, you might be able to read between the lines easier if you stop to think.
The witch hunt comment btw does not exclusively involve looking for people to kick. A witch hunt, in general, just means you're actively looking for someone to single out. I'm not claiming you're going to kick them or mistreat people, I'm just stating that you're going to be hunting for people doing something relatively harmless but not up to par, even if it may not be necessary to do so. There's no need to police your fellow players where it might not be needed. This is partly a dev philosophy as well, which is why we don't see heavy DPS checks in what we consider simple content.