> The world has to accept it.

Foreign countries can and do block American technology from sensitive sectors all the time. Your comment is especially inexplicable when the context is China, which blocks a whole host of American websites.

> (I assume they are, but there is no proof.)

I don't really understand your position here. You say yourself that Huawei devices are probably backdoored. I also believe this, and presumably the USG does as well. Given that Chinese corporations only exist if they are in the CPC's good graces, it is a reasonable assumption. Why is ironclad proof required before taking action then? Nobody is on trial here, there is no requirement for "proof beyond a reasonable doubt".