Almost anything that pits states against the federal government should be encouraged as a step towards decentralization and the dismantling of gargantuan government. From Brandon Smith at alt-market.us:
The concept of “sanctuary cities” has long been implemented within predominantly leftist states in America. It’s not anything new. Any operations by DHS and ICE (Immigration and Customs Enforcement) within blue states to arrest and deport illegal immigrants are often met with aggressive resistance by Democrat run city governments.
Keep in mind that foreign individuals have no right under the constitution to reside in the US without first gaining citizenship. Leftists say they don’t care and are happy to welcome millions of illegals into the country with open arms in direct violation of laws protecting our borders as well as the stability of our economy and society. They do this NOT because they are naively humanitarian; rather, they see it as a means to import a massive voting block that will give leftists whatever they want because they believe they will get citizenship in exchange.
If they didn’t want millions of illegal votes, then Democrats would not be constantly attempting to block voter ID laws.
Obviously, the political left is openly hostile to federal agencies when those agencies happen to obstruct their agenda. Though it’s rare these days for blue states and the feds to be at odds, it does happen. ICE and other agencies might try to find ways around sanctuary status, but there is never any question of “treason” or “insurrection.” Blue state politicians don’t get raided or arrested as national enemies.