They got sentenced for vandalizing irreplaceable art, not for ‘throwing soup’.
People who damage culturally significant, irreplaceable things to get attention for their cause deserve this kind of punishment or worse. They have the same mindset as the Taliban blowing up cliff carvings. And they lack the intelligence and creativity to bring attention to their cause without destroying things.
Do we need to fix our societies destruction of our own planet’s habitability? Yes without question. This isn’t the way.