Because, more often than not, the one hitting no is the one who threw the game because they can't play safe, roam, support or just plain stop from being toxic, because it's not 5 minutes it can be an extra 15 just holding inhib or Nexus towers just waiting for respawn times to get long enough they can brute Force your Nexus down. Just a slow and painful death because of 1 or 2 holding the game hostage, Inhib is down at 18 minutes, the tank is building damage and the Midlaner can't land a skill shot nor survive long enough to try anymore because everyone on the enemy team can one shot, are you telling me I should have to wait 3+ extra minutes just watching the game slowly end while if I decide I don't wanna play and stop trying I get punished? Meanwhile how often have you seen a feeder get punished or a troll? And the most tilting part is a troll is forcing you to play a game and they can, they simply can at the very least they can for 20 minutes, it's no longer fun, it's forced, it's stressful, it's ridiculous and more importantly BORING