Why are assassin players so arrogant?

People who play , , and are perhaps the most arrogant players in this game. I just do not see why they think they are so amazing good at this game, when their character consists of 1-2 button combos with either no mana, low mana costs or no cooldowns on abilities.

Playing anything else at the moment but pure damage dealers like this is basically like playing with one hand tied behind your back. Damage is completely over the top at the moment and it shows in how many people get false delusions of grandeur just for playing these ridiculously simple combo based champions.

(Before you downvote... please consider this... assassins have the highest damage numbers in the game but ALSO the best mobility as well. I have always believed this is massively unfair because playing any other class, you must be willing to die during a teamfight but most assassins get a free "get out of danger free" card, like 's ultimate for absolutely NO REASON.)

Can people give me a reason for what assassins deserve to be the ONLY class in the game that can easily escape from a bad teamfight? Why do they also get the best damage numbers in the game by a mile on top of that. Riot, pick one or the other but don't give them both!