in China, all scientists are pro-CCP. in Russia, all scientists are pro-Putin.
In Russia and China, the scientists at least claim to be pro-government. In the US, the left wing is against the current government.
Are you saying that there are a lot of right-wing scientists, but that they're afraid of the government? That wouldn't make sense.
Maybe a lot of right-wing scientists exist but don't wish to speak out for some other reason, but it's certainly not the government.
in all three countries, dissent is an informal crime.