Why is this a thing?

So there are some ADCs (, ) who decide to rush Tear of the Goddess... WHY? Literally ever ADC that does this does the exact same thing. Here a very accurate example of how their lane will go "Game starts, everything is normal. First back buys , and , or while the enemy ADC buys at least or if they got the gold . From that point on, all the ADC with the "Super OP Riot WTF are you thinking, nerf this item into the ground now" item ( ) proceeds to do nothing. Meanwhile the enemy ADC who is going with a more normal/viable built bullies the "Tear ADC" so hard that they barely get cs, or exp. So the "Tear ADC" loses lane, and loses hard, if the jungler comes to gank well... it makes things worse due to the "ADC" have less damage output then a with only . But this is OK because this build works, you just have to hit that epic powerspike. So about the time of the "powerspike" the "Tear ADC" has went (lets assume they did well) 0/5/2 and now has a manamune, and either part of the or part of a oh yes the powerspike is here, they go into a teamfight and the enemy ADC 1 shots them due to them being 8/0/3 and having , , , and . IF the "Tear ADC" does get a chance to attack they do maybe 1/3rd at best the damage of the other ADC.

This is literally every Ezreal and Kai'sa. Look into the stats at the end of the game and you'll see their damage to be laughably low. Almost any support will out do their damage by a wide margin, on top of providing either utility, tank, or both. So with the "Rush Tear of the Goddess because people in LCS/top 0.1% can pull it off but anybody lower then Diamond will just feed" build not working why do people keep doing it? On the extremely rare games where I seen an Ezreal or Kai'sa build normally (1 game for each) they did well. In every other game though it follows the exact pattern above, with very slight differences. This is painful on so many levels as pretty much anything you could want them for, other ADCs do better, you wanna poke and farm safely, Caitlyn, you wanna push down towers quickly, Trist, you wanna wait til mid/late game for a powerspike, Vayne and Draven, you wanna shred the enemy team, Twitch and Lucian.