one man is not a jury - You're making this statement with the idea that people with a CCW go around looking for crimes and ways to be a hero. They don't. People that carry are not the retards you see in movies who jump through the air, slide over the top of an ice cream freezer, shoot 4 bad guys, then say "looks like they got their just desserts". You have likely been in numerous rooms, buildings, and parks with a CCWer and you didn't even know it, WHY? Because they mind their own business, just like you do. The difference is that when they HAVE to act to defend themselves they are not doing it with a cup of Starbuck's coffe and their Ipod.
crossfire is dangerous - One of the first things that any good instructor will teach you is CHECK YOUR BACKGROUND. If you fire off a shot that misses and it hits Sally Sue Homemaker then you are responsible for it. It is drilled into everyone that attends a CCW course.