I wouldn't be surprised if significantly more cis women were harassed by anti transgender "feminists" in womens' restrooms than harassed by actual transgender women in womens' restrooms. People worrying about whether other people belong in a specific restroom are the real safety risk.
Issue is you can't tell the difference between a man calling himself a woman to harass women and a man calling himself a woman since he feel he is a woman. That is the main reason people are against these things, it doesn't matter if the "real trans people" are not an issue.
Source for a "man calling himself a woman to harass women" actually going into women's restrooms to do that? I'm not aware of any substantial number of instances, especially compared to the instances I've seen of women being harassed by other women because of this line of thinking.
