Don't forget what coons can do to a sweetcorn patch in a single night!
I don't think anybody is suggesting meadfarm is lying or exaggerating. He just asked how worried he should be. Some of us in the county with swallows have not seen it to be a problem. Some of us in the country with swallows have. Some just have other ideas for handling it other than shooting the birds... :)
I do and have had livestock and more than an acre of vegetables to protect. Sometimes problems can be dealt with in unique ways, which is what people have been offering. As for nothing else flying before drones, that's certainly not what I am seeing around here. We have tons of moths, butterflies, flies, wasps, hornets, mosquitos, lightning bugs, bumblebees and other flying creatures, but I have yet to see the drones fly.