As this new debate heats up I started doing some reading up.

Sanctuary cities have been around for thousands of years. Glasgow, Scotland, is a noted sanctuary city. It is a result of compassion and concern by some for our fellow human beings who may be threatened or persecuted because of the color of their skin, or citizenship status, outside of the city.
It has its roots in different religious philosophies, including, of course, Christianity. Christianity is well known for its message of peace, love and acceptance. It used to be that if a citizen in need took shelter in a Catholic church no human authority could touch them.
The movement for sanctuary cities in the US started in the early 80s. It’s not a new thing.

Why are some people so against it?