I am sorry to say that horrible stories about mikva'os are 100% true -- and then some.
L'aniyas da'ati, all mikvaos for men should be off limits to any children. No child under the age of 18 should go. Period.
I personally know of many many boys who were molested in mikva'os.
I am in close contact with an ex-chassidishe young adult who, over time, was raped by at least 10 men; among them, rebbeim, often in mikvaos.…
Men like Marvin Schick and Rabbi Avi Shafran close their eyes to this and to many other problems in the haredi world. Their desire to "defend" haredism from "attackers" and to present the community it the best possible light blinds them to the real devastation in their midst. Both are very talented men. If they would direct their energies inward into cleaning up abuses in the haredi world, instead of outward at those who "attack,' they could save many lives. Gentlemen?