Because boxing is the ultimate redemption story. Boxing doesn't care if you're rich, poor, young, old, tall, short, fat, skinny, black, white, Jewish, muslim, christian, a genius, an illiterate, (and now) a man, woman, gay, or straight.
If you've got the determination to put in the work, the bravery to partake in an act that may, hurt, disfigure, possibly kill you, and likely disable you. The heart to take punishment and accept that you'll earn a living with your hands. The mental fortitude to understand that you are partaking in the most unnatural act of taking pain as well as inflicting pain.
And then have the courage to shake your opponents hand (win or lose) in the ultimate fraternal understanding?
Thats why I love Boxing.