The problem is that once this location data is available, it's easily abused by the police. Here are some quotes for you:

That's what, Cory Hutcheson, ex-Sheriff of Mississippi County, MO, is accused of doing; prosecutors say that for three years, Hutcheson abused Securus's system to track all kinds of people — even a local judge — without a warrant. https://boingboing.net/2018/05/12/extraordinary-access.html

While many departments require warrants to use phone tracking in nonemergencies, others claim broad discretion to get the records on their own, according to 5,500 pages of internal records obtained by the American Civil Liberties Union from 205 police departments nationwide. https://nyti.ms/450FPqK

U.S. Marshal Adrian O. Pena allegedly abused the Securus system by simply uploading blank documents and pretending he had authority to track people he had personal relationships with and their spouses. https://www.vice.com/en/article/k7bqew/us-marshal-securus-ph...