It doesn’t matter how long you make them read Lenin and break rocks in the gulag, the second you let them out they’ll see an AI generated meme from a CIA holdout posting from a bunker somewhere and immediately revert to being a burgerbrained fash.
I think we need to just dump them on an island somewhere and put them under continuous naval blockade and internet blackout till they revert to a Hunter gather society.
My take is more that they could be re-educated, but that the gulags will be full. Some of them are going to have to go into a deep hole in the ground.