protesters deal with various agencies from private security, city police on up to federal FBI etc. These measures will help in the most common scenarios and prevent further escalation. 99.999% of protestors are not going against NSA counter-intel teams, they are encountering low-level private security or police who escalate the situation.

Every security practice is a risk/reward. The measures being offered here are no-cost measures which can reduce the exposure of evidence to casual security / police.