You have to know when to cut your losses...
I recently had a teammate run deep into enemy jungle, got chased by the enemy team, I was clearing out mid creeps, saw him running for dear life toward dragon.. "HE IS A GONER", at that point there is no use making a 1 v 5, a 2 v 5 and feeding the enemy 2 kills.. So I ran the other way. "YOU COULD HAVE DONE SOMETHING" he crys, "WHY DID YOU RUN!?" He yells...
You have to know when to cut your losses
Simple minded people are use to watching high level play where 1 death could mean a large gap and potential game changing effect... That being the case.. If 1 death happens in the lower brackets ("GG YOU FED") syndrome occurs. The best way to counter them is to go on a rampage and carry your own weight moving forward.... Cleaning up and winning tends to shut those folks up..
Bot lane.. The goal is for 0 deaths...
If someone HAS TO DIE.. I would rather it be support
Worst case scenario- both bot laners die... While it puts you behind, still not the end of the world.