According to this Grant Swank column, these rent-a-cops battered the minister in question for daring to "walk around and talk to people".
No complaints were made about the pastor and the only thing he did wrong was violate the inner prejudices of these peons making Barney Fife look like Robocop.
Corporatists will counter that, as a private establishment, those running the mall are free to establish whatever expectations they want.
If that's the case, shouldn't they be free to bar those of a particular race or ethnicity?
Frankly, there are certain dignities the individual should be accorded regardless of whose propety one happens to be on at the time if it is open to the general public and one is not endangering the physical safety of others.