Its certainly true that grazing is hard to pin down as intentional. That's why it happens - the perpetrator can always plausibly deny it. If someone makes a woman feel uncomfortable and she announces it, as you recommend, the grazer can deny it, call her crazy, and get away without feeling he's lost any face. That's the problem that I think the article addresses: despite being legitimate harassment, its difficult to call it out. I don't have the answer for it, but I don't think legislation or the violence that's been proposed by you and other posters are really the right way to go.