I'm about to set fire to my karma. Le' Ouch!

Should copywrite protect plagiarism? For example if you rip off 7 Samurai, should your work be protected? Magnificent 7, Battle Beyond The Stars, Rogue One, etc?

How about everyone and their neighbor, ripping off Groundhog's Day?

While we all give genius points, if you can take a famous work and knock it off, and no one knows until you rub it in their face, Aronofsky win's with Mother (I don't believe anyone will take the title away from him, after that one). What about the 0 effort rip offs?

I know what Disney would say, but what is the general opinion?

I work in comedy and parody so I'm completely dependent on people ripping things off. If people stopped doing that I'd be dead in the water. Well okay, not completely dead, I'd just have to give up parody. Since I enjoy it so much, I do not want to give that up.

Should my parodies be protected?