>>106076699You could argue that Castle is so psychotically hardline that he can escalate gang violence instead of containing it. It depends on the writer, but Ennis does a great job at creating a tone where you're not sure if Frank is a "good guy" so much as "the least evil guy." Pic related, even if it's not canon.
Ennis Punisher would would probably sneer at the idea that he "saves lives and communities." He's aware that his actions won't matter in the grand scheme of things. Castle is motivated by something much more complex and uncomfortable than being some kind of hero.