What is the reason why some say that Bradley won ?

Whos that in your avi

 

Because we weren't fooled by Pac's nonsensical flurry of missed shots nor by HBO's tickling of his testicles all night long.

 

Multiple reasons, actually.

1) Manny Pacquiao Hate
2) Floyd Mayweather Love (1 & 2 are interchangeable in a lot of ways)
3) Temporary Blindness
4) Insanity
5) Total Inability to score a fight; basically, Bradley kicked Pacquiao's ass if you love watching flicker jabs and slapping hooks that get caught on the gloves and value those punches more than the cleaner, harder, more numerous blows Pacquiao was landing in virtually every round.