People play what is fun for them, sometimes it matches their personality and sometimes it doesn’t, in my opinion the reason is because it has no correlation whatsoever.
Me for example, I’m a very “physical” guy, I like martial arts, weapons like swords, shields and spears, and also I find guns very fun (paintball) but I’d never play a Monk or a Hunter, in fact my mains are Warlock and Mage which are casters, simply because I find them engaging and comfy.
So you can be a nice and honorable person and also be the scummiest Rogue or a 10 million mastery Teemo, but that doesn’t mean you’re a bad guy.