I say Pluto is the best planet that ever got robbed of its status by people much smaller than it. Just because it can't talk and they can.
Seriously, humans defending pluto over this ENTIRELY arbitrary definition which doesn't even affect it is the most STUPID thing ever. Making it a planet with its discovery had no effect on it, and neither did reclassifying it.
The only reason I can think of why people are so convinced is simply because of ridiculous use of empathy. It's like someone was given a promotion, and you're happy for them, but then they get demoted back again to a position they were better suited for anyway, but people still get angry for no fucking reason... except its not like a human where the demotion can affect something like their pay. It's like when a person steps on a Roomba and is then so sorry even though it doesn't even do anything.
The only other thing I can think of is that people grew up learning that Pluto was a planet, and don't want to accept the change, and that what they learned could be wrong (kinda like Galileo and the church), or that something that they learned might not make much sense.
Seriously, can everyone stop whining about Pluto... It really doesn't matter.