Unpopular opinion: trolling is usually never 100% the troll's fault and can be prevented
So, I never understood this concept myself until last game. I was on the verge of trolling. Lux gave First Blood, called me bad because I died to Thresh (After killing Jhin, and Thresh was still had much more HP than I did, and started E, it was also difficult to poke because I was playing Sivir) and basically ditched the lane to roam, leaving me to 2v1 Jhin and Thresh, while calling me a sha bi (basically means mentally deficit person in Mandarin and telling me I don't know how to play.)
I pleaded for her to come back to lane, but she told me she doesn't play with bad ADCs. Anyways, no one said a word against it, or tried to help me out, and I was running a major gold deficit versus a fed Jhin, who could basically dive me at that point with his Thresh. Decided to int, after tilting my arse off.
Fortunately, Amumu came to help and asked Lux to come back to lane, and offered some kind words. Decided that it'd be a dick move to make such a nice guy lose on account of one dick.
Long story short, some kind words and encouragement can go a long way to prevent a loss, and the troll, if coming into the game with good intentions, does not deserve the entire portion of the blame.
Edit: If I can offer an incentive for you guys to post your counterarguments instead of just downvoting, I will be giving everyone free upvotes regardless of what your argument is as long as it's relevant to the discussion at hand. Pls. Post your opinion.
Double edit: Please stay civil. Mods, if this thing gets out of hand, please lock instead of deleting, I kinda want to use this for my philosophy ISP. Btw guys, Im using this + your responses for my philosophy ISP.