Lethality making game un-fun

First of all i love the game. But this thing. This LETHALITY. Right now i played a game of well rounded composition with 2 tanks, Strong mid , healing support and adc. Against us was Pantheon-LETHALITY. Diana-Overall i think she's doing way more damage than she should. Zed-LEHTALITY. And Jinx with Morgana botlane. Past this 3 months i was listening to my friend whining about lethality and how it made the game un-fun for him. And at first i thought he's just whining crybaby. But now i can see he was right. It's great Riot gave us 10 bans. But i have 1 ban. And with that i can't ban Zed,Talon,Pantheon,Diana,Kha'zix,Rengar and Lee sin at the same time. As a support player i get frustrated when my lane loses. But it's almost impossible not to get frustrated when enemy mid laner comes at bot lane for a snack for his dusk blade. This lethality meta is killing me, and really makes me not want to play. I am scared to play ranked now because i know my enemy will pick assasin. I don't know where the well rounded team composition went. Now all you have to do is pick something like Zed lethality support and win. And of course don't forget to buy the ancient coin. Please, do something about lehtality. I don't need to get one shot by Zed. Thanks.