haha you're funny. pads protect the hitter. meaning you can hit someone harder and in a more dangerous way with pads on. (ie leading with your head). the violence and force in helmet to helmet collisions in football has no match in any other sport. not rugby, not hockey, nothing.
also the pad argument is moot cause hockey players wear pads and nobody is questioning how badass they are. they just don't lead with their heads when they hit.
i sort of laugh when i watch rugby hits. football is so much faster than rugby and the guys are so much bigger. We all know F=ma, the force of the hits is so much greater in football. even hockey has bigger hits than rugby.
Also football is the most cerebral sport out there. There is a lot of breaks in the action but there is a lot going on in between plays, strategy wise. More strategy and planning goes into football than any other sport. The QB position is the most cerebral position in sports. All that information has to be processed and a decision made before getting crushed from your blindside by a fullspeed 350lb d-lineman who can still run a 4.7 40. Someone find me another position that's as difficult mentally and physically as that.