Yes, there are corruptions and scandals every now and then, but those culprits get dealt with whenever a large percentage of the people are concerned about it. So in the end, majority of the people are indeed happy with the government.
So having said all of these, yes, my comments come across as propaganda to you, but consider it the other way round, would you defend your government's controversial policies? In other words, are you willing to "spread propaganda" out of your own will for your government's policies (on abortion, taxes, immigration, surveillance laws)? Chances are, about half of the population would not (based on approval ratings and voting patterns).
So you see, while some countries focuses on having people constantly challenging and keeping the government in check, others focuses on building trust between the government and the people. And hence, to answer your question, yes, it's propaganda, but I do it out of my trust in my government. That is something I see most foreigners struggle to understand because it goes against their belief.
Think of it another way, every government is simply trying to make their country great, and that includes making people happy and maintaining their mandate. Just because one approach is different from the rest, does not mean it is ill-intended or evil. There is no reason at all for any government to do something unpopular with majority of people. The only chance for something bad to happen is when the government is completely out of touch with the people. It happened a few times in the past in China. It is happening now in the U.S. But I don't see it happening in China any time soon.