It's kind of fascinating how important the defacing of the national insignia is in the reporting in China. An authoritarian government like China's has no real mandate - they have no right to be running the country and no legitimacy that can be claimed. They're a bunch of men that the army listens to. They have the guns and the power and that's it. With such a government, symbols and flags are the proxies for legitim…
Many people feel the same towards their country's flag, which is merely a piece of fabric.
Legitimacy is also in the eye of the beholder, with one's perception of history, cultural or ethnic identity, and politics playing significant roles.
All of these are of course abstractions, just like symbols like the flag and like the very notion of a country itself. Yet there's no shortage of people willing to kill and die for them.