They're attacking the Swedish model, doing things that no one had done for a century. It's not illegal to bring in local strike breakers (aka scabs) because it's so extremely frowned upon that no one did it anyway. You made your argument the wrong way around - if Tesla don't like the Swedish culture and customs, they can move to a different country.

Americans would go crazy if some swedes swooped in and tried to change fundamental mechanics of the US culture and system from abroad.

An example needs to made here and that's why the other unions are joining in. Your beloved role model will end up with egg on his face.