Why are people so stupid?

I was fed as Garen won the lane then pushed,destroyed 2 nexus turrets. While attacking turret I was killed. My team stole baron (while I was dead) but they died. My team insta surrendered. Enemy didnt even got our inhib turret and this half brain monkeys just ff it was 4/1 vote for surr. Free game. People are so fking stupid in low elo soooooo stupid why would you ever ff when having free nexus????? They also had afk Irelia...btw And gea Rito nerf Shyvana ty