Why does botlane always feed?

I'm tired of playing 3v5 when botlane always has given the enemy half their total kills. Why is it so %%%%ing hard for you support and adc mains? "hurr durr tp botlane and save them hehehe" good luck doing that when botlane dies every single minute without a chance to tp there. I played so many games lately which could'v won but lost because our botlane fed the enemy. I don't want stupid %%%%ing answers like git gud or lol silver salty, I want an actual answer or a tip so I don't have to say "Botlane you die more than 10 times you get reported for inting" every single game.
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