Because they are using their soft power to get influence all over the world which does not align with our values, and at a certain point they might no longer only use soft power...Taiwan as a first.
But as Trump has also threatened to take territory with force, it and European allied territory no less, then China was actually the lesser evil, even as a communist dictatorship.
Obviously I cannot speak for everyone, but as an American you should feel welcome in Europe, but you really have to stop electing idiots as presidents.