When you're 10 + kills behind, grouping mid DOESN'T WORK!
I get stuck in far, FAR too many teams that just want to do this like its all they know how to do!
Too many people refuse to change they're play style or builds when they fall behind, and losing 3 to 5 team mates 5 + times doesn't seem to deter them from trying the same thing until they lose!
Why is so hard for people to focus other lanes?, build armor/MR?, form a defensive line under a tower rather then running out to no man's land?, do ANYTHING other then rush mid against a more fed enemy team and expect it to work after it's failed 6 times!? If you lose the first 5 v 5 you'll lose the next one WORSE if you try to do it right away after re-spawning!
This has happened to me in more games then I care to count! The 9/12/6 person will say "Group and push mid" "OMFG why are you top!?" "Report ___ for not helping!" ... and the rest of the team listens to THIS instead if "Split push, force them apart!" "group under tower" "build thornmail"...
People, you need to know when NOT to listen to someone! The same strategy doesn't work every game. If you fall behind early, you have to compensate for it!; not pretend nothing is wrong and keep playing like you're up 10+ kills!