There was evidence of Allison Mack's grooming. And she went to prison for it. Her stay there was much too short, granted, but she was convicted. If evidence of Emma Watson being a groomer comes out, I'd expect the same outcome.

Tentative links aren't enough to establish guilt though.

So should people be looking for evidence? Of course. But until there is some, she's just an obnoxious, feminist shitheel instead of a groomer shitheel.