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Several US schools to install pepper-spraying drones to respond to school shootings
(www.theguardian.com)
This is a most excellent place for technology news and articles.
Just like fighting gym leader Brock with Charmander.

They're not that easy to hit. I once invited someone to try hitting my camera drone with a 9mm and they couldn't, despite all bluster and claims otherwise. it might have been easier inside a building.
But, any rounds expended toward the drone are rounds not sent to children/staff. And an FPV drone to the face even without pepper spray can mess up someone's aim.
"Its not perfect, therefore no effort should be expended toward any possible harm reduction"
This assumes that there is a potential for harm reduction in this proposal...which there is not.
Non sequitur fallacy and then some. Not only didn't I say "it's not perfect", I said it's completely stupid such as what's depicted in the illustration above. I also didn't say "no effort should be expended", in fact, my first sentence proves the contrary: most efforts should be concentrated on the root causes. And the last sentence quotes the article, symptomatic measures should be prevention, e.g., patrol. Money towards these drones can be spent far more wisely.
Wait until you find out drones are used for patrols too.
Outside this makes total sense. Inside, not at all. And I say this as a quadcopter pilot myself.
This isn't a case of perfect being the enemy of good. This is a case of the drones simply not being a good response.
A friend was annoying me with one, so I caught it with my hand from behind, and held it steady.
I've a little DJI drone and an old Matrix drone, the matrix has four 800 watt motors spinning 15" blades. You're welcome to try and stick your hand in that one to see if you can catch it.