Regardless of who provides the slingshots, someone has got to know how to use them.
Still, even with foreign support, Ukraine has singlehandedly revolutionized drone warfare. That is awesome and extremely frightening at the same time. The Switchblade was neat, but it supposedly costs $52k. Ukraine is strapping RPGs to drones for what? About $1k?
Imagine a psychopath has broken into your house and is attacking your family. You call the authorities and everyone in between to protect you, nobody listens, you call your friends to come help but they're busy and have to think about it. Nobody is coming and this psycho keeps killing your kids. Better grab the gun. Suddenly all your friends are like "don't do it! Guns bad!"