People don’t understand that the way a backdoor is usually implemented is not going to be obviously saying “backdoor_here”, neither it will look like a some magic code loading a large string and unzipping it on the fly – that’s sus af. What you will see is some “play video” functionality that has a very subtle buffer overflow bug that’s also not trivially triggerable.
This already happened with WhatsApp.
That’s a far cry from how china suppresses protests. And really a small individual example. Overall there’s a clear freedom of expression and civil protest in the US. The same absolutely cannot be said about china.