Assassins nerfs

I keep hearing people getting pissed because their favorite assassins are getting nerfed, this is why because well a Katarina jumping into a fight where she's really good at taking out adc and apc but often she was able to take out more than just the carries which isn't her job. I'm all for the assassins nerfs and sick of tired of people complaining yes adc is at end game going to produce the most damage so if an assassin could get in there to kill them that would be awesome but at the same time it's not supposed to be easy if it was too easy then there would be no need for a marksman at all. That's why riot nerfed a lot of assassins and even some tanks because marksman were getting stomped and wrecked badly and the team couldn't protect them, that's why assassins mostly and some tanks got nerfed. Another reason was that a lot of people were snowballing so hard off playing an op assassin that they be carring their teams, which isn't what an assassin is supposed to do, his sole purpose is to take out that apc/adc out of the game if he dies but still takes his target out he did his job if not then he didn't. It's really simple marksman and mages are the carries that's how the game is you don't like it then play another game.