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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.
The US has guns and they're being oppressed just fine.
Because there's no political or popular will to do anything about it. You can lead a horse to water but you can't make it drink; that doesn't mean water is useless.
So then it's not the guns that make resistance possible it's popular will.
I mean obviously, but with popular will you'll want everything to give your cause an edge—hence the guns. It's possible to have popular will and still fail, so factors that give the rebellion (or just plain old resistance, see: Black Panthers) an edge are going to be necessary. In recent history, the Houthis definitely benefited from having guns when they rebelled against the then-government.