I imagine they're in a hurry to get it done and leave the game, or play on the next alt.
I'm usually in the first category.
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i have been in maybe 15-20 pugs during bfa, only 2 had people raging, me being one of those but a more general rage like how can we so stupid, not a personal atack.
i have failed many many many keys by myself (pre 15's mostly during uldir)
i have seen people fail 15-19's during bfa with moderate to little ammount of raging from the group.
in m+ i only pug with 2k+ score right now and i've only seen 2 groups that i can remember being very toxic, 1 was the tank towards me (so i'm maybe bias) and on the other it was the group towards a hunter. they kicked him right before we completed the key. the rest were melow or usually just left when the key was burned.
i remember farming like a retard on lfr legion and rarely had bad experiences, mostly it was just chat like hur dur lfr.
i assume this mostly happens in HC pugs, the game got harder and with all the inflated ilvl people go there and fail, they get shit on and don't really enjoy that.
i fail to see the wow you're seeing as we are playing different games it seems.
most of this shit behaviour takes places at the "starting" point of endgame...like normal/hc/+7_+13. after that people from what i've seen are more chill, focused on their game and aware that fuckups happen.
as most people do not get over that start point for some reason they are always engaging with idiots thus seeing the whole game as toxic, far from it.
this raid at least from my view has many death on fail mechanics that your casual weekly players has a higher chance of failing, that's why i said the game is harder. i tried pugging opulence a few times and out of 10 pugs i killed it maybe with 3 on HC.
i view the game same as you even though my experiences lately are different, i'm mostly stuck with my draenor experience when i was at the starting part. alot of hc pugging, group breaks and what not until i got tired of it and started playing in guilds. never looked back, i would simply delete the game if i didn't have enough time to guild raid.
so if you only want normal/hc/7+_+13 by pugging in this game, well i expect you'll have a short stay unless you simply don't give a shit, in which case more power to ya.
that's how i view it.