The same mums are raising girls who are not growing up to be violent...
Well, no, according to trans ideology, the same mums are now raising girls (with penises) who grow up to be violent, and sons (with vulvas) who don't grow up to be violent. Nothing to do with gender! It is all the mother's fault. (But the mother to be blamed for male violence is only ever a "ciswoman" I imagine ...)
Trans ideology serves to obfuscate how idiotic this shit is, by making people unable to differentiate between male and female in crime stats,etc.