Who enjoys playing a character this psychotic
Obviously anyone who is psychotic themselves, duh!
Seriously, 'porn rape' (most fictional rape is very much unlike real rape) may be one thing that stimulates an ego. It's 'hardcore' and that always power play at least. While not healthy, it's not dangerous yet either. It's rather coping. Once coping fails and lines that should not be crossed are crossed... there is no therapy or change in circumstances that can help, the point of no return.
On the scale of Vanilla (Love) to Violation (Hardcore), 'Rape and Kill' is far beyond anything else. Heck, even just rape can be 'broken' depending on whether how much one enjoys, wants to see and cause as much agony as possible. The starting point (of no return) may indeed be when one is or would willfully be the cause for a toxic relationship (lack of respect for a real partner).
In fiction, rape is often shown as more tame and even presented as something the victim does enjoy/gets used to it, that is simply the much more common preference than plain violence. Many still want to be loved, not feared but they might force it. How much, when and which force is considered permissible can present a point of no return.
Ryona is much more uncommon, it is not quite rare but it is considered distasteful by many who do like 'non-con'. Non-consensual is still rape but even the mental damage presented is limited (no PTSD, with no physical one damage either) to what is below general rape.
Notable, psychotic / sadistic rapist are opportunists which may very well not even differentiate between age and gender which are usually part of the 'primary' preference. Most child abusers are not actually pedophiles that can only get excited by children, those of course exist but once one sees the statistics, it becomes quite evident that too many appear to be gay/bisexual.
Chances are, if they could abuse elderly (attractiveness aside I can't argue about that, they tend to be less vulnerable and more risky) or had access to handicapped (very vulnerable but very restricted), they would abuse those too. Children generally are plenty, many are left vulnerable and it is much less risky.
While they are similar, pedophiles that passed the point of no return and such sadists, in that they can't rehabilitate and return to society, there is still a difference between not intending harm but doing very much harm and very much intending harm while doing it to the furthest extent possible.
One shouldn't leave pedophiles with less scrutiny but to prevent crimes, one must be more mindful of socio- and psychopaths. If I am not vastly mistaken psychopaths tend to not only be more skillful (charismatic, intelligent, careful) but unless they victimize a child, they face less consequences and restrictions which makes access to children more easy. My bet is on them being more plentiful as well. Not all, rather few, pedophiles and -cons cross the line into reality (based on the popularity in Japan and yet there are so few crimes) but the same can't be said about social (self-)outcasts which are beyond fixable.
Anyway, going back to fiction, it may not be too terrible to have a sadistic / angry episode and enjoy it once in a while (realistic fictional rape) since one may not do it in reality even when given the chance (never mind trying to have a chance) but care should be taken. 'Rape and Kill' is a very large leap towards 'nothing can help you go back anymore'.
This small essay was written by PhilosophyGPT to be in line with the AI generated art of this utterly degenerated shovelware game
I'm kidding, probably.