Most street fights are over in seconds. Those that aren't usually involve two clowns too drunk, weak, or uncoordinated to cause the slightest harm to their opponent. Someone who knows how to throw a proper punch with power and timing, or someone who knows how to put someone on their head with force, etc. will end the stupidity of a street fight very quickly. Legitimate fights that last more than a few seconds will almost always involve objects in the environment and/or the involvement of more than two people. It's almost never like the movies, and certainly not like the juvenile imagination of wannabees like Dogboy. Most of all, they are utterly stupid, and if any do go on long enough they are likely to eventually involve weapons and serious injury or death over something pointless and unnecessary.
MMA is a sport just as boxing is and other combat sports/arts are. Hapless clowns like Dogboy watch MMA matches and come down with Rocky Syndrome. They are lucky if they make it home after watching a PPV fight with 15 other 5'2" doughy dopes covered in stupid tattoos they will regret in a few years without pissing someone off.