Crime statistics do not support your view that predatory lesbians are a significant risk.
The same cannot be said for males.
There is also a concern that it is a huge mistake for boys to be encouraged throughout childhood to believe they are girls.
This leads them into wanting a future based on lifelong medication and, often, surgery to their perfectly healthy bodies.
If, instead, they were allowed to be boys with whatever preferences & interests they want, they could emerge as happy adult men.
(The same applies to girls identifying as boys and becoming women.)