People in the public eye who express support (or even just love) for the President of the United States, pay a price, in lost revenue, vilification in the media, and alienation of friends and family. Attacks on the President are rewarded with applause and promotion in the media, and protection from boycotts in business.
Most people can’t really afford to absorb the kind of abuse that support for President Trump entails. So those who do view him favorably in any way are forced into silence.
I’m 74, self-employed, and not desperate for human company, so I can live with the slings and arrows. Many cannot. This silent majority is larger and more hidden than anything in Nixon’s time.