How is the NSA personally dangerous to you?

Compared to any TLAs in China, the NSA is far more likely to take action against a US citizen for a thing that citizen chose to say. It's likely there's a low amount of actual danger but it's greater than that of what China poses.

If you live in the US, you're under US federal jurisdiction.

Unless you're regularly traveling to China or unearthing info that can seriously harm China, they're not going to send anyone after you.

I rather be spied on by a foreign government than my own.

As a non US citizen living in a western country, the NSA has no qualms analyzing everything I do/say/think, including in my activism, and tell on me to the government of my country.