And also goes into something I should have explained, namely why November 17 is a day of protest and why students are key: :
On 17 November 1973, tanks of the then six-year-old [American supported] military dictatorship burst through the iron railings to suppress a student uprising against the colonels.
The exact casualty figure is still unknown to this day but it is believed that around 40 people were killed. The sacrifice of the polytechnic was so significant that the post-junta architects of Greece's new constitution drafted the right of asylum, which bans the authorities from entering the grounds of schools and universities.
That is why places of learning are the springboards for the current wave of violence and it also explains why many of the riots are in university towns.
Students and pupils have effectively been given carte blanche to carry on protesting, because their professors have declared a three-day strike.
Greece also has long history of students going on strike. As an American professor, I find that very amusing. Also, it is illegal to have a private college or university in Greece. The state has a legal monopoly on post high-school education. That's a shame. It's why a lot of Greeks travel abroad to get a better education.
Expect things to calm down by Thursday when the professors' three-day strike ends.