One of the most depressing moments in my experience of teaching in universities here came a few years ago, when I was discussing preparations for the Olympics with a group of sophomores.
We got on to the issues of security and policing, and I suggested that extra manpower might be needed.
The first rather naive response was that the entire police force from nearby cities such as Tianjin would be bussed over here. ("What - all of them? Isn't Tianjin hosting some Olympic events as well? And don't you think there's some danger of a crimewave, if there are no police left there at all?" No, actually, I rather liked that idea: I pictured a mass mah jong tournament between the police forces of the two cities.)
Then several people suggested we could just use the army.
Now, there's a place for the armed services in the security arrangements, of course - specialist rapid-response units to deal with bomb disposal or hostage-taking incidents, that kind of thing. But putting the military out on the streets for regular policing duties, maintaining public order? That really doesn't look good. It makes it look as though your government is so unpopular that there is a constant threat of riot or revolt, and that the only way it can control its own people is by the threat of armed force. (They did in fact station quite a number of members of the armed forces along the main routes north from the city centre to the Olympic Green - but at least they were in ceremonial uniform, and only carrying sidearms, not rifles or machine-guns. Even so, I felt it created a slightly creepy, threatening atmosphere.)
The majority of these kids, alas, had grown up in complete ignorance of what happened here in 1989. They didn't know that the murder of civilians by the PLA is still what Beijing and Tiananmen Square is best known for around most of the world. They didn't understand the resonances of deploying soldiers on the streets of your capital city, didn't recognise the signals that it sends to people.
That, for me, is one of the most terrible things about this week's anniversary. The Party's propaganda on the subject has been largely successful. Today, most people in this country probably neither know nor care very much about the 1989 crackdown; even those that know something about it mostly fail to understand why it's so important.