Hang on a minute. This a prime hypothesis testing space! If you really think that anti-rape messaging makes post-rape experience worse, it surely follows that it must be worse for women than for men, this messaging being mostly aimed at women. So you can quite conveniently check your theory by comparing the incidence of ptsd, depression, etc in male and female rape survivors.

Not necessarily. If male rape is not acknowledged at all, it can be much harder to talk about it and heal.