Do you realise some drones can fly hundreds of meter above the site, even a few kilometres ? Do you realise that what you send up must come down eventually ? Do you realise that you need to send massive amount of projectiles to take down an object that size ? Do you think you're smarter than everyone on the ground and in the command chain ? If shotguns were the solution you'd see much more videos of them being used on the front line, but they're only sporadically used, and from videos circulating online you can clearly see they're barely better than useless.
