I think you hit the nail on the head here. We celebrate this (and it is admittedly kind of cool) because we crave the catharsis of seeing people actually doing stuff, but by itself this is not a revolutionary action.

To their credit, it seems like the group itself acknowledged this in their statement, and is mostly hoping that the fire will serve as agitprop. But like you said, I don't think most of the local proles will see it that way.