The language used, the phrases and rationalizations given by reporters as well as those involved are always telling. Here's what Casey Jordon, a criminologist talking head, said on CNN:
“They didn’t try to shut down the protest. They simply turned off the cell service so it couldn’t become viral,” Jordan explained. “It really is just a cost/benefit analysis of where your freedom of speech begins to threaten the public safety.”The propaganda inherent in Jordon's statement: it's all okay, since "they" didn't interfere with any protest. They "simply" "turned off the cell service..." Authorities "simply" shut off everyone's cell phone access, with the intent of preserving public safety. The message is clear: no one is behaving illegally, or like Big Brother, "simply" protecting all of us from ourselves.
Shutting off cell phones was the idea of BART's; Jim Allison of BART "...reportedly admitted that the tactic had been part of a "larger strategy." " [italics mine] What the "larger strategy" is, or was, is not stated.
Telling, too, that the protest in question was to protest the murders and violence committed by San Franscio police.