No, it wasn't. It was neither of those. It did not get locked because we were having discussion on some racism. It did not get locked because people were asked to cool down and they didn't - in fact, people did not need to cool down at all.
The only thing wrong with the topic was some people PM'd each other. And some people did reports after a mod told them to.
You're free to believe what you want.
But your second and third sentences are contradictory.