Why should i play support?

can't do sht. Yes my adc can also go lethality and i can also have a team full of lethality but i have no job here as a support. I can't save anyones ass if they get burst down in 0.01 sec. It doesn't matter if my team is also killing in 0.01 sec as i have no damage nor can i save them with my heals/shields. I feel like a 5th wheel. When a zed does a W, Q, E + TL combo and kills you, imagine how annoying it gets as he does that from miles away. Doesn't even need a fkn ult. Just when i got over the fact that mages were dominating bot lane then lethality sht pops up.
I am the 1000th person that has been moaning on this issue but you see the issue is that riot will not nerf the items. I can guarantee that the nerf will be so minor and will follow such a crazy logic that'll most likely make you WTF. I am actually leaving support until this lethality gets properly fixed and not just -5 lethality on yoomu.
