They knew there were many other objects like Pluto. So they discovered one even bigger than Pluto, one that would HAVE to be called a Planet.
So the scientists said "oh shit, there are more of them, many more. I don't want to study so many planets. oh my god, oh my god... we're gonna have to kick Pluto out of the planet club."
What?!
What are you, men or mice?
I'm serious. You're scientists, you're supposed to WANT to study these things!
Most people become scientists because they love it, because it's fun, but obviously not those that run the Big Media Scientist Club that decides these things!
goodness.
Have a nice day, the world is crazy.
David S. Annderson