I can't believe someone would have a problem with this? Who cares? So you know there are some fish there - that in no way means you are going to catch them. If people were using them to sight fish and then chuck a stick of dynamite in the water, or proceed to throw weighted treble hooks at them, then yes - that is a problem.
I have a buddy who flies a drone regularly. He has tried using it fishing. It spooks fish (imagine that - as a bird is probably one of the biggest predators on fish and that would be imprinted even on adults). I'm not sure how effective it could possibly be then, knowing that it spooks most fish depending on the height you fly it at. You'd have to sight them, then let the run rest, and then still not know you're going to catch them. I'd rather not see them there, as that is more annoying sometimes.
Just to give you an idea of how ridiculous this sounds, consider what Reiber said. Would you also like to ban having a friend stand on a high point or in a tree to point you to where fish are on clear rivers? Completely ban fishing on clear rivers because being able to see them is unfair? Another fabricated "problem" to whine about.