A fork requires utxo owners to sell to one side or to the other of the fork. Of course you have a choice to not sell, but if everyone moves to the side you don't like by selling your side then I win. The attack vector is over self custody.

This has always happened with money. It's the same as it is now. Those who understand money and value their life over a long time horizon will keep the true Bitcoin. The other forks will die off eventually, even if they get a higher purchasing power for a while. It's brutal, but it keeps the network free from usurpers and gullible people who would be poor stewards.