Here is the problem. You are basically arguing that the police should be biased in their policing.
Police are banned from endorsing racist organizations, like the KKK, right?
So, should the police respond to a murder call?
What if the victim is a member of the KKK?
Would responding to that murder call be “endorsing the KKK”? Of course not!
Too slippery slope for you?
Ok, should they respond to a robbery call from a KKK member?
How about an assault call from a KKK member?
You are basically arguing that as soon as a city/state deems a group “bad”, they should lose ALL legal protection and rights? That isn’t how the United States works. In the United States, even non-citizens have rights.
Our society is predicated on the concept that all people are treated equally under the law.
Take the president as the ultimate example. He has great latitude in how he chooses to enforce legislation. However, he is not allowed to undermine the legislation. His granted “latitude” is in practical and effective enforcement.
The latitude is pragmatic. It isn’t total carte blanche to do whatever the fuck he wants.