Early Surrender

Just popping a few questions I would like answered.

From an actual design point, why is it alright for one player to hold four other players in a game? If 80% of a team does not want to play anymore, is it fair for 20% to be the deciding factor?

Why does it even need a different amount of votes than a normal surrender? The same thing is happening either way.

Why are surrender votes not a simple majority in any case?

Just a couple questions, would love a riot response.