[2019] Why is it so difficult for people to at least try to play the game out rather than tilting to no return?

I feel like so many of the games now are decided by whatever player has the worst mental breakdown after one thing doesn't go their way.

Like 90 percent of the games that I play/watch have someone calling ff at 5min because they died one or two times, or someone accidentally took 1cs, or a teammate didn't do exactly what they wanted them to. So they just stop trying and afk split/die or anything to put the team at a disadvantage.

"If I can't carry, I'll make sure no one else can!".. I'm genuinely curious as to why so many people have this attitude.

Its so frustrating that so many players know that they don't need to be afraid of any consequence to their game ruining mental.