They do this to hide the pattern that is inevitably created by Man with his portable HAARP arrays, or the next generation thereof.
Dutchsinse, et al, will see the pattern and not only know, but show the world, the pattern.
Nature, left alone, takes care of itself, all the way down to species like us, should we overpopulate. It's Designed that way.
Arrogant Man has to diddle everything.