The Mexican flags and the strident assertions of a right to violate American laws are a danger signal to this society, as they would be to any society.

The releasing of children from schools to take part in these marches and the support of the marchers’ goals by some religious leaders demonstrate that this contempt for the laws of the land has spread well beyond immigrant communities.[ Immigration "solutions" by Thomas Sowell - Apr 11, 2006]

Yes, the “contempt for the laws of the land” is fairly prevalent. See here and here for a couple of egregious examples.