I'll just go ahead and copy a previous comment I made for this one, because as always a lot of people don't feel like reading the article.
"Painting was behind glass, the point is that in a climate change hellscape all this precious art is in danger. If all the people who read about a painting they've never heard of before get angry about "paint being thrown at it" they'll really hate what'll happen with extreme weather in a climate disaster. "
These activists have some weird ideas sometimes, but this isn't really one of them. If you read the article they all acknowledge that what they did they aren't somehow entitled to do, and that they will probably go to jail for it as well. The entire point as with all protest is to shove it in the face of all the people that ignore this issue on a daily basis.
Oil companies are doing the same thing to all precious art and nature and all the things you love, so where is the accountability for them?
TL;DR these people are annoying, and that's the fucking point.
A man literally self-immolated to try to bring attention to our lack of effort to confront climate change. It was barely covered and you don't seem to even know it happened. But you're here fantasizing about violence because they threw some soup on a painting's protective glass, so it seems like that's actually working.