Why do people complain that assassins can one, two or three shot you?

Thats WHAT ASSASSINS DO! They kill you quickly in order to silence you, thats it. They don't give you a chance to fight back, they end you and end you right there and then to prevent you from assisting his/her enemies.

These are the champions I consider assassins, so don't complain about them, please stop.

As for this idiot: He is not an assassin in my opinion, more of a fighter.