People who burn or otherwise desecrate the US flags are usually US citizens.  It's not clear how one could tell from any of the videos that the people are immigrants, unless, of course, one believes that anyone who looks Latino is an immigrant....
I am not judging you.  I am drawing conclusions, based on what you write.  Most people who know many immigrants do not make the sweeping generalizations that you made.  But, of course, maybe you are completely different from everyone else.....