If police have truly unlawfully had journalists arrested then the proof should be shown to Trump himself (or Barr) so he can get to the bottom of it. He could question or get Barr to question the arresting officers to find out why they arrested them.
I will take their words over the words of "journalists" from lying "news" organizations like CNN or MSNBC. Left-leaning media has been caught lying so many times I've lost count at this point.