[{quoted}](name=M15TAH JAY,realm=NA,application-id=3ErqAdtq,discussion-id=3mXUzKn8,comment-id=0002,timestamp=2015-12-24T20:05:45.313+0000)
It's because people are stupid and don't know how to setup masteries for shit...like the other guy said ali should have windspeakers why he had thunderlord is beyond me but its people who don't know how to play their role and or they just choose to ignore it i understand sometimes its fine to go off meta but this is stupid i only use thunderlords on champs i can get the most use out of it with if I play support i use support masteries so i can play my damn role properly and not be a tryhard looking for kills while looking like reject the whole time
I wouldn't go that far. First of all, the keystone is at the bottom of the tree made for non-tank supports, so it's not like supports are going out of their way to invest in a tree they wouldn't have invested in otherwise.
Furthermore, Thunderlord's can be justified on many supports. All mages supports, for starters, since they don't make good use of the other keystones. Sona is a decent user of TL since she can AA-Q-PC quickly with relative ease for a lot of poke on the enemy bot lane. I gave it a couple of tries as Sona and it works nicely, if you don't get overzealous trying to proc it. She does work very well with Windspeaker too, so I'd say it's a choice between more aggro in lane VS more sustain and damage prevention.
Overall it is a good keystone for poke/mage supports who seek to further enhance their poke (especially those who don't use Windspeaker well or at all). Why a full melee tank support got it over Bond of Stone is beyond me. Didn't work out too well for him, he got the proc like... twice in the laning phase (well, we were playing Janna + Ez so pretty hard for him to stick). I could imagine, however, someone like Leona going more gimmicky and using it since EQW (which is what she'll do anyway) procs it for surprise dmg that can be helpful in a bursty lane.