It definitely feels like shit when some of your team gets completely blown out of the water, but honestly, every role can play a part in the success of their bot lane.
If your bot lane is getting smashed, odds are they are pushed in pretty hard, which means:
- Top can TP in
- Jg can gank
- Mid can roam
One, two, or all three of you can come crashing into the enemy bot lane and stop the bleeding.
I cant count the number of times I've been in a game where i've been tower dove by 3 or 4 enemies on 2 or 3 occasions, hobble out of lane completely crippled, then have my teammates ask, "WTF Bot lane"
I get that lanes will get smashed, but if the enemy team is being proactive about ganging up on your bot lane, then you either need to take equivalent advantages on the opposite side of the map, or you need to position to protect your bot.
If you dont do either of those things in response to the enemy ganging up on your duo lane, then I really cant sympathize with your complaint.