Just a totally mindless act of slaughter.
Nope. Let's be absolutely claar that this was a premeditated attack, with a political message. The old adage says that war happens when politics fails, but wars also happen when politics becomes a form of terrorism. This kind of terrorism would be familiar to anyone who living in opposition to an oppressive regime, or maybe for people who failed to stop a form of terrorising politics becoming an oppressive regime...
When the Nazis came for the communists,
I remained silent;
I was not a communist.
When they locked up the social democrats,
I remained silent;
I was not a social democrat.
When they came for the trade unionists,
I did not speak out;
I was not a trade unionist.
When they came for the Jews,
I remained silent;
I wasn't a Jew.
When they came for me,
there was no one left to speak out.