The thing is, it's really an important conversation to have- Elon shouldn't be censoring people. The question is- "do we need all these foreign techies? and if so, why?" and "We don't have enough good Americans" is not a sufficient answer. Vaguely threatening people with China isn't going to work either.
What is even coming out of silicon valley these days that people actually want? I don't need a phone app that will track the gas volume and pressure of my farts. What specifically does America get for bringing these people in? That is what people want to know.