There are more extreme things, but then that starts being something other than “protest”.

Eh, watch some French protests, especially ones involving French farmers. Spraying manure into government buildings is one of the classics.

As long as you don’t kill anybody (or any pets or livestock), it’s still just a protest.

(And Medialab AI doesn’t seem to have any human employees left, only executives and marketing drones, so no one would get hurt if it got burned down, on the contrary, it’d be a net benefit for humanity).