Nerf Now is a webcomic about video games. Team Fortress and Starcraft, mostly.
Ryu (a wandering martial artist) and Sakura( a schoolgirl, who studies Ryu's fighting style) are characters from the Street Fighter games, by Capcom.
The comic depicted Ryu beating up Sakura, and going to jail for it. It breaks the basic premise of the series in that most, if not all of these characters should be in prison for murder, brawling, street fighting, or war crimes.
Shadowloo have thousands of skilled martial artists, doing their evil work. Why doesn't someone important just bomb their base? Why do these ragtag heroes feel the need to save the world by punching people?
edit:Okay, I can see, Chun Li's motive; she doesn't care about saving the world, she just wants to give Mike Bison the Death of a Thousand Kicks.
However, most of our heroes seem to fight evil because, well ... what else are they going to fight? They already fight each other all the time for practice, and that just get's old.
Of course, for Ryu, that would probably be considered an adequete motive. Dude just likes to fight stuff.
