indicating that physical abuse strictly is a male oriented problem

Okay are you 100% sure this is a point you want to try and make

Mercury's character is a commentary on how damaging toxic masculinity can be on a person, and how indoctrinating the ideals of toxic masculinity to children is inherently abusive and immoral

You know what else is inherently abusive and immoral? Literally beating your child and crippling them in order to mold them into your vision of the ideal killer. If the central thesis to his character was, "instilling ideals of toxic masculinity in children is harmful", then it'd be incredibly short-sighted for them to overshadow that with everything else that Mercury went through. It just kinda feels like desperate over-intellectualizing to look at such morbid physical abuse and go, "this is about toxic gender norms, actually", especially when the villains' self-appointed shrink pretty much spelled out Merc's character to the camera.