It's very hard to understand how TRUE Americans can stand by and allow this behavour. The base premis of a Santuary city is to help criminal activity and to allow the laws of America to be broken. If a citizen went out and say, held up at gun point a person, and then asked for the Sanctuary city protect them, would this be OK as well.
If you break the laws of entering into the USA by any other means other than proper paper work, AS SO MANY PEOPLE ACTUALLY DO, then you area criminal, period.