I don't even know any billionaires so no, they've never told me what to think.
I'm just utilizing my own brain and my own brain says taxing unrealized gains is ridiculously stupid and unamerican. No matter what your income level is.
Part of being an adult is defending the rights of people you don't like. For instance, I find you to be incredibly childish and off putting but I wouldn't want you to have to pay tax on unrealized gains. I also wish you would stop talking because everything that comes out of your mouth is immature gibberish but I still defend your right to free speech, even though I'm tired of hearing what you have to say on the subject.
It's part of adulting. You gotta take the good with the bad. If you want billionaires to pay more taxes, there's plenty of other less corrupt ways to go about it.