On the other hand (not responding to anyone in particular, just rambling), this whole revenge flick has nothing to do with the victim. Tormenting the criminals ten times instead of the same amount as what she went through won't undo her death or the suffering before it. He is simply lashing out because he is in pain and it feels good to inflict pain onto the ones responsible for it.
And honestly, if the father wanted to indulge in some revenge porn, he should've used his wealth as a bludgeon to reduce every single family of the perpetrators to homeless vagrants, blatantly killed the kids off in technically-plausibly-deniable ways like traffic accidents and street crime, then watched from his ivory tower as the parents go crazy with the knowledge there is nothing they can do.
Bonus points if some of them go the route of the parents of the MC in Rooftop Swordmaster and self-immolate.
He is not avenging the daughter's pain, he is avenging his own pain, so it only makes sense that he would strike against the ones who absolutely failed to raise children who are not subhuman troglodytes, instead of the retarded wannabe Hydes.
tl;dr skill issue