It sounds like you're arguing that since all these traits are used to determine between a single binary classification (or spectrum) in different ways that there's no multi-dimensionality but perhaps you're misunderstanding.
If biological sex is something that can be accurately represented in a certain multidimensional space then every axis will necessarily have the same type of value (a range from female to male) but a different orientation (or trait being evaluated). This is the same as how you place a mathematical point in space by using 3 axes with the same type of value (-inf to +inf) but different orientations. You need all 3 axes to place the point and can't collapse its location down to a single axis. Similarly we should understand biological sex as something that can be measured by specific traits but never collapsed down to a single value and thus is intrinsically and inescapably multidimensional.
Female to male is one dimension of measurement, yes, but that's only meaningful for individual traits. An individual has many traits and so must be described in multidimensional terms even for a single metric.
Rape is in a different category from those other crimes. So is child abuse and torture. The perpetrators of these crimes need for their victim's lives to have value so they can enjoy destroying that value. The victims are weak, vulnerable, innocent and the perpetrator needs them that way for the crime to satisfy them.
The cops in GTA are neither innocent nor weak nor vulnerable. When you hurt civilians their pain isn't the point, they just happened to be in the way of your quest marker. It's not about cruelty.
Imagine if someone made a game where you just rape and kill kids and torture animals. Would that seem equivalent to GTA or would it seem like some fucked up serial killer shit?