Enjoying rough sex is NOT the same as being a rapist or even misogynist. <modsnip>. His "urges" were for control and revenge, not sex. He's a true sadist -- which is not the same as "rough sex urges" or even BDSM. He had no safe word.
I think this man was desperately unhappy his whole life, and very, very angry at people who he perceived as having the life he did not. A safe home. A bed partner. Gifts of jewelry, inherited heirlooms, photos of good times. The women were all attractive, he had a pock-marked face and was an incel (Involuntary Celibate, an idiotic and narcissistic term for shallow lonely people). He couldn't even expect to have a happy life. That's why he took these trophies and destroyed these lives and had no interest in the cash. He HAD cash. He didn't have the intimacy and connections that the people he destroyed did. He was out for revenge for his terrible life. The only thing he excelled at, that he was lucky at, was terrorizing, raping and killing people. He was an over-achiever there, the best ever, and very famous. No one could possibly argue about his prowess there.
When he got married, it almost got even worse -- because he was very unhappily married, and it became clear that he would NEVER have the happiness that others seem to have. I think his crimes slowed down or stopped for several reasons, technology advances, physical limitations, and he got a job he found mildly challenging that lasted and had children, which gave him a taste of life's connections. Eventually, when you are disillusioned with life, you adjust your expectations. It's the only way to get through it. Also known as becoming wiser. He was still angry and he drank too much and had a terrible temper. But his life trajectory went another way and he found SOME satisfaction in other avenues. Work. Fatherhood. Building things. His meticulous lawn.
Note -- I don't care for rough sex, I know the difference between sex and violence, I have experienced misogyny, and dealt with much jealousy, envy, and disillusionment in my time. I have also been very lucky in life after great disappointment. So this is all MOOOO. :->