Because the EU respects the One China policy (like virtually every UN member) and because the EU does not have hundreds of military bases surrounding China.
Thats such a cop-out, the US doesn't respect the one china policy any differently to the EU. And no one is threatening China in anyone shape or form. Your argument holds as much weight as Russia using NATO as an excuse.
The US stance is it acknowledges that China believes that Taiwan is part of China. That is the equiv of saying “I know you think the sky is green, I just don’t share the same opinion.”
The US’s position is that it’s up to Taiwan to decide its own fate. And will not allow china to invade and force Taiwan to join China.
This has been the same position for the last 70 years. Taiwan has been an ally of the US long before the CCP was created.
