The idea that US is good and China is evil is absurd. Other Americans do far more to destroy "ideals of freedom and our western way of life" than China does - hell, I'm pretty sure that with the current US polarisation, both sides would say they have more in common with China than with their US opponents - and they'd be right. Take any concept of "freedom" or "way of life" that you care for, and half the US is currently against it. TikTok is a bogeyman that has done nothing to Americans that Americans weren't already doing to themselves.
The US is good-er. There are bad people in the US of course, but this will always be the case and can’t be a reason we restrict ourselves from increasing the good in the world. This argument boils down to “there are bad things and bad people even among us, so we have no moral standing to prevent any more evil”.
Again, no. That fatalistic attitude doesn’t help anyone and is just a suicide pact. We have a responsibility to expand the good in the world. That includes domestically with rooting out our evil, but also includes keeping China out.
