Re: Maybe if they collected less insects, there would be more around...
Although that isn't such a problem, where the studies are carried out, they are already protected areas.
Heavy industrial farming is probably the biggest problem, along with general air pollution.
The news here (Germany) last night ran the story and the emphasis was more heavily on the use of pesticides and turning traditional open fields into agricultural fields, with crops that aren't suited to the insects.
One positive effect of the German policy on agriculture is that there are little to no gene manipulated crops here. Consumers have come out strongly against them and there is a growing trend to organic fruit and veg.