It was always a genocidal slogan. "From the river to the sea" was put into practice by Hamas for all the world to see in every town, kibbutz, etc they overran. They went house to house killing everyone they could find except those they wanted to take back to Gaza as hostages. Hamas didn't do it in secret. They broadcast it and reveled in it. There's no really no excuse anymore, no more ignorance to be feigned that it's just a political slogan about freedom for everyone. In cities from New York to DC to Barcelona crowds gathered chanting that slogan, praising intifada, and cheered mass slaughter, kidnapping, and rape and justifying it as resistance.
Others still deny what Hamas themselves broadcast.
People cheered as this guy talked about Hamas attack on a dance festival where 260+ young men and women were gunned down. Where women were raped next to the corpses of their friends. Where women were dragged off back to Gaza. He says don't worry, they're being treated fine, despite what the New York Post says. We've seen footage of a half naked dead woman kidnapped from the festival in the back of a truck being driven through the streets of Gaza so passersby can lean over the bed and spit on her corpse. Of another woman from the festival, so violently raped her pants are soaked in blood, shoved into a car while barbarians scream how great God is.
Fareed Zakaria had a "moderate" Palestinian guest on his CNN show to get that perspective, and the dude adamantly denied Hamas targeted civilians and Zakaria just let it go with no pushback. He'll face no criticism from his profession for letting a guest lie about mass slaughter because of who the victims were.
It's a very disquieting mix of willful ignorance and the celebration of slaughter. It didn't happen, but if it did it's actually good anyway because it's decolonization and liberation. And these will be the same people who will cry the loudest when Israel defends itself.