You can't harass members who play Face Hunter, nor are they compelled to make preemptive apologies or justifications for playing it. They don't hack or crack their opponents' game, they simply play existing cards that form a specific deck. If you suck at countering Face Hunter, you should blame the designers, not the community.
Mad Scientist makes this scary. Hunter's version of Mirror Entity that encourages them to leave up minions on the opponent's board and go face. Just the very existence of this and Snake Trap will make hunter secrets a complete nightmare to figure out, and this looks strong enough to make it into some lists.