2. Some people from the New Mexico county in which Clyde Tombaugh (the tireless discover of said celestial body) was born wanted to honor him, in defiance of the slithy toves and slimy weasels that would deprive him of his hard-earned recognition. I'm not going to provide a link you probably won't follow anyway, but you might find that he deduced the presence of an unseen planet from perturbations of Neptune's orbit and found the tiny pinprick of light only after weeks of staring into "blink-comparators" which alternate views of the same patch of sky taken over an interval.
Pluto is not responsible for the perturbations in Neptune's orbit. Tombaugh was wrong. And how hard he worked has exactly what the hell to do with whether it's a planet or not? Deprive him of his recognition? Pluto should have never been declared a planet in the first place, and the only reason it was considered so was due to the PR groundwork laid by Percival Lowell, who was a far better showman than he was a scientist.
What is your solution on how to deal with the questions raised by Sedna and Xena? Ignore them, make them all planets, what?