I have said it before and I will say it yet again, freedom of speech is for that speech we find most loathsome. That includes flag burning. It includes skin-heads and Nation of Islam and the Westboro Church. Freedom of speech even allows idiots like the NFL quarterback from San Francisco, who demonstrates his opposition to oppression by wearing a T-shirt of Fidel Castro.
Trump is wrong to want to punish flag-burners. They deserve our contempt, our derision, or disgust, but they have every right to burn the flag.
Tyranny is a word that has fallen from fashion. Stripping a person of citizenship and throwing him in jail over their dissent is tyranny at its worst.