and communist Russia is a fine example. They had a "good Tsar" in the mid-1800s, here is a picture
and people were happy enough: he introduced more trains and employment and so on. The next Tsar, Ol' Man 'Orrible, was more of a C-minus affair cracking down hard and getting complaints. Here is his picture
but after a bit the next one turned up, a bit of a drip maybe, yet willing to hear what his people had to say. After all, they were complaining. Here he is
and they turned up at the palace and he was going to give them an audience but his security detail shot them all before the message (that they wanted to talk to the Tsar about their complaint) could get from the gate to the palace and back again. It was a long driveway. And what happened next? Communism.
If they hadn't started complaining they wouldn't have been shot and the ones who'd been reading commie propaganda would never have gotten a foothold. Karl Marx, for reference, was writing at the time of the "good Tsar" (and Abraham Lincoln) almost to the year. But could they be happy? No. They had to start complaining.