At the several protests I attended I have observed members of the press taking notes on a pad. They also use phones, recorders and cameras, but the notepad apparently is a failsafe device still in vogue.
The above might be filled with mace so that one could jot down the important information and then use the pen for self-defense.
Or one could fill it with essential oils, as recommended, and hope a pleasant smell would calm roiled nerves at a protest.
I suppose a ballpoint pen isn’t the best graffiti tool, but it might work in a pinch.
All to say this item might be useful in this city.