Regardless of the back and forth accusations with Vice, a no doxing rule seems reasonable. Online mobs can be dangerous and are one of the thornier complexities of managing social networks.
Yeah, Patreon has to maintain their rules for their service. It doesn't matter how someone feels wronged, they don't get a pass. Can you imagine the road they would've been going down if they'd let Wu stay? Every single ToS violation would've been litigated through social media. Whether or not Vice did something wrong is a matter for Wu & Vice to resolve, not Patreon.