Why is it okay for Americans to burn their country’s flag?

This point should be said to be related to the American state system.

The United States itself is a country of immigrants, so its openness and freedom are something we cannot quite understand.

They have no traditions and no unified country, so the people are very free. They can burn their own flags or change the flags into underwear.

A country of pure immigrants has no cohesion, so burning the flag is nothing strange for them.

But as a unified multi-ethnic country, we will never allow such behavior.

Except for the United States, it seems that no other country in the world acquiesces in burning its own flag.

The United States only "tacitly acquiesces", and there is no American law that stipulates the burning of the flag.