The difference is how that surveillance is used. Right now you my not have any personal contact with China, so you might not care what the do to their own citizens. I might have taken the same stance in 2001 before meeting the girl who would later become my wife, who was a Chinese citizen. Since then I’ve travelled to China for work, completely independently of any family connection. A relative, child or grandchild of yours could work in China, marry a Chinese partner. I could go on.

Even aside from that, China is actively exporting their political and economic model all over the world. They are using economic investments and financial grants to companies, institutions and cultural organisations as leverage to stifle criticism, and silence factual reporting of events in China all over the world, and almost certainly in your own country too.