Japanese people complain about everything, especially when it's anonymous. Just look at Google maps reviews, or product reviews on amazon.co.jp: you'll see 1-s

Japanese people complain about everything, especially when it's anonymous. Just look at Google maps reviews, or product reviews on amazon.co.jp: you'll see 1-star reviews for stuff just because something wasn't quite perfect. It's probably the same for the politicians; they complain, but the alternatives are worse in their minds. Plus, much of the population is elderly, and their preferences are quite different than the younger people you hear more from.