I don’t quite understand how you’re able to acknowledge the rarity of such a sensationalised case as Isla Bryson’s, yet still use it to justify your support for policy that would hurt the trans people you know.
Acknowledge? It is unclear whether MtF transsexuals have an incidence of commiting rape more similar to biological males or to biological females. So whether it is in fact "rare" (relative to the male base rate) or "frequent" (relative to the female base rate) is not established here.
More research is needed, but I think it's not an unexpected conclusion. I mean, the only difference between these men and other men is that they're calling themselves women. Most of them keep their genitals intact, and most are driven to identify as women due to a paraphilia.