Modding is a form of art. You want credit for making it, just like a painter wants credit for his painting, a sculptor the credit for his sculpture, etc.
And that is the way it has always been with modding - it is not the new modders you are seeing who are fighting for their rights, it is the old ones. The old breed of modders are fighting for their rights because the new breed do not know about the etiquette and moral of the modding community, so they do as they please. This has increased as of late, because Skyrim was too much of a success for it's own good, and Steam Workshop was a bad move, which further helps in bringing the bad of the new breed in to the modding scene (the new breed is not bad, but by Thor there are lots of bad in there!).