While I do believe that we owe to those who fought to give us freedom years ago, but I do not believe using that same reason to justify the current state of affair.
To repay the kindness given to you, does not mean you have to follow blindly and nodding yes to everything.
Change might be good. If change proves to not bring any good, we can always go back to how it used to be. We have the power, don't we?
p/s: The Casual Vacancy is so unlike HP but I still like Rowling's writing tho.