Indeed, these symbols/logos/trademarks or what have you all seem to act as targets for gun-wielding criminals. Be it Superman's "S" or The Flash's lightning bolt or Spider-Man's spider, they all scream, Why, hello, evil doers! Fire your bullets at this! For it is a symbol of who I am and the means by which I shall bring you to justice! (Okay, so maybe that's not exactly what they say, but you get the point.)
How would we know recognize these people if not for their insignias? How would we even know what to call them? And does it help that they're color coded?