I don't know how old you are, or what your lived experience has been. But the US did not invent the idea of democracy, nor did anyone promise us that democracy could actually work.

What the United States has accomplish over the last 200 or so years is remarkable, but it's colossally myopic to believe that the US has never curtailed the rights of it's citizens in the name of security. The OSS was never legal. The CIA definitely should not be legal. And lord only knows what the NSA does. But I promise you that restricting access to a Chinese mobile app is not the most egregious thing the United States Government has ever done.