You know, when I envisioned this, I imagined some person with a 5-gallon sprayer, like they use for yards/pesticides. I sort of assumed they’d be doing it alone, with no one around, and (presumably) with some knowledge/awareness of how those sprayers work - so like, protective clothing, a mask, goggles, and being upwind. But you’re right that it’s dangerous despite all that. And it’s sort of an obvious thing to be carrying around.

New mental picture of this activity: Jars that have been safely filled at home thrown from a distance while no one else is around.
Or for discretion, a tide pen that has had the contents replaced. Bonus: It will still remove stains (and the fabric).

Ultimately, however, it’s not something I’d actually entertain. I don’t see that as an effective outlet for any statement I’d like to make. Surely not for the risk/reward proposition. But it’s darn funny to think about.