[zen928]

Enforcement of federal law is not the duty of the states, and refusing cooperation is not the same thing as obstructing federal law itself. It really is not difficult to understand why people do not want federal agencies demanding compliance outside proper jurisdictional limits, due process, or chain of custody protections.

Much like the shortsighted reliance on executive orders as a substitute for legislation, critiques of sanctuary cities often boil down to the assumption that the federal government should be able to override local autonomy whenever politically convenient. But the entire constitutional structure exists to place limits on government power, not remove them whenever those limits become inconvenient. "Its not unreasonable to deport illegal immigrants" is a remedial, one dimensional view.