Didn’t they throw it at a protective barrier, though? So zero potential of damaging the art?
Throwing soup at an oil exec is assault on a human being and would be worse, ethically, because human beings have sensory apparatuses and, presumably at least some level of emotion.
If you punched someone in the mouth because they threw soup at a protective plastic barrier in a museum, then it is you who would be the “utter cunt”.
π=3