How is it impossible to prove? If those influential cultures and values were never killed, they'd still exist today like some of them do.
There are still arab countries that see pedophilia as normal, that video of the 30 yo something with a 14 year old girl he forcefully married because "culture" comes to mind.
How do you change those people in your world? Education, waiting for time to do something just because, and being nice won't do shit. It's heavily ingrained in them, sadly, I don't blame them, I blame the culture they grew up in.
I really cannot believe that you believe broken evil people would suddenly turn good and change just because of time or something. When they do that is because they were forced to by the people, the status quo, or simply someone bigger than them. That's what History has proven to all of us countless of times for you to say something this nefarious.
There are cultural values that don't deserve an ounce of respect or preservation at all, no matter what. People need to understand this and stop playing the "Love and Peace" hippie bs already, because look at what it's doing and allowing to happen. I feel so bad for those little kids, I wish I could do more. It's crazy that you do not.