Attitude in the Early Game

I don't understand how players expect to win if they give up within the first 10 minutes. I've had lots of games where players decide the outcome of the game based on the KDA's of the team in the (extremely) early game. Just because one team dies a few times in the beginning, doesn't mean that they've already lost. If you think that early game decides the entire game, then you've lost and ignore the fact that this is a team game with phases. Tilting off of dying first or an unsuccessful gank doesn't help in the comeback. Sure, these kills and deaths affect how the early game is played and how strategies change, but they don't decide who wins and who loses right then and there. That's just how the game is played, sometimes it's a stomp and sometimes it's a pendulum swing. Thinking that you've already lost in the first 10 minutes, just secures the victory for the other team. If you expect to lose, there's almost a guarantee that you will. Expecting that so early, just makes it that much easier for the enemy team to win.