How many of these villains plan on outright killing their respective heroic rivals?
Frank knows people who will pay top dollar for most of them if delivered alive. And money is the universal lifeblood, people.
Fun thing is Crow would probably try to not kill Durga, to the point that if she's captured by the villains, she might actually set Durga free. Crow may be a crazy bitch but she still cares about her best friend! Even though that damned woman tore down her operations at least three times. It all depends on what kind of relationships Crow builds with the rest of the villains :P