One of the most frustrating things in league

Ive never really understood this but when i queue up for ranked i try to win but some people want to give up as soon as the game gets a little be too hard or even when we give first blood they instantly say "gg we lost" or "i give up im going to not help" etc so they end up just running around and trolling it makes me so pissed because why even queue if your just gonna give up and most of the time they get away with it