However, enforcement of immigration laws has been one of the biggest parts of his election platform, if not the central part(build the wall, etc).
I imagine his voters are happy to see some action being taken.
The protestors could really do with some better optics, destroying property and waving foreign flags is just going to increase approval for military action.
If the protestors had instead marched peacefully with American flags, it would have been a much better PR win.