Had me til the last paragraph with "only concerned with anything that threatens multiculturalism." On the whole, liberals highly rate values like individualism, novelty, and fairness, which results in a lot of acceptance mantras, recycling, and donations to the war-stricken and impoverished.
Republicans favor loyalty to hierarchy, the rights of the group instead of the individual, and yes, tradition. They naturally generate opponents in anything that threatens that normal and where change is involved, it's almost always the right clinging to tradition like a terrified child.
They do drive valid points about rigidity. The left so highly values fairness that they will NEVER do things in any other than by the book, even in the face of certain defeat. They will eat mud first before they ever risk compromising on their idyllic moral standard.
The right stopped playing by the book over a decade ago, at minimum. They have a very good handle on the insight that the rules are imaginary, and only matter if everyone agrees to play. Everyone says stealing and murder are wrong, but technically speaking, it turns out you don't poof from existence if you do. Actually, most of those go unsolved forever.
Which brings us here, with the left scrambling to enforce an accepted way of doing things and instill change through the "proper" channels, and the right partying like it's 1699 because literally nothing happens. By the time they're done being tried for every offense, we'll all be dead of old age.
Also, yeah, that would have been a much better Harry Potter. Taken as a whole, he really was just a douchey little jock riding the coattails of his friends and some arcane prophecy that should by Rule of Cool have always been Neville. You don't just have that kind of setup and then trash it at the very last minute, why even put it in at all.