Illegal immigration is a problem (NSS) but I suspect if the feds would force states to greatly restrict tax-funded services to illegals -- and the courts supported them -- a lot of the problem would go away.
But as far as government law being sacred, I'm not a legal absolutist. If Congress should pass a law demanding I surrender my firearms, I would disobey. If I were a Mexican sickened by the corruption and hopelessness of my native land, I would hop the border. I cannot get upset at them for doing that.
What I generally hear from Bush's opponents is whining or impractical solutions.
You would disobey because you know it's unconstitutional and as an American citizen are guaranteed those rights.
Illegals are invading trash and do not have the right to disobey our laws regardless of what is happening in their own country.