Saying that effective tactics should not be used because bad people also use them only disempowers those under attack.
The professor was brave enough to put her name to her opinion. I think those opposing her should also be as brave and let their names be known and let everyone see their responses. If that is negative because of the way they expressed them, then they might see that their behaviour is not terribly acceptable.
Honestly, I used to agree with you on this, but I'm starting to think that this craziness isn't going to end until the "activists" start getting a taste of their own medicine. And it's not like they won't claim they're being persecuted anyway...
It's far too easy for activists and anti-activists alike to get caught up in the crusade, and it's not hard to imagine that someone names an "activist in need of a taste of their own medicine" that gets piled on before anyone realizes a mistake was made and an innocent was punished, perhaps even irreparably.