In some place like Mainland China you might get hassled by the cops for expressing your views. That can happen in America too but you have to at very least hassle your neighbors first.
The problem in the us is you can say what you want and nobody cares. Go ask for investment in broadband and the cable company will hang up the phone.
I think many Trump voters are ashamed to speak their views because they are personally ashamed of those views. If you are an evangelical Christian for instance you pray to God for forgiveness every day. One of them asks Trump when was the last time he prayed for forgiveness and Trump said "never".
Of course if Trump had ever gone to a church service and participated he would have said the Lord's Prayer and asked for forgiveness. He probably sat through it 10 minutes before he was questioned.
Trump would not ask for forgiveness because he would never believe he did anything wrong. George Floyd was "born again" and for him it changed his life for the better, and I am sure Floyd asked God for forgiveness the day that he died.
And that is it, you have some people who are normally very concerned about right and wrong, witnessing, leadership and people's character and they have gotten behind a person of very poor character and they feel cognitive dissonance and it hurts.
Conservatives suffer the same dissonance with the Coronavirus because conservatives are more afraid of filth and sickness and contamination than liberals, not to mention they tend to defer to authority figures such as the medical establishment.
It causes them a lot of suffering to be part of a tribe which violates what they believe in and if they were forced into a real conversation and values clarification they would not find it easy.