The only footage is of the aftermath. But if you want to disregard the eyewitness reports, then I guess you can be you.

Here’s a CNN report (you have to watch the video) where two eyewitnesses say the protestor tried to punch out the glass. I mean… I’m not accusing the person of being smart, trying to break bulletproof glass with their fists.

https://www.cnn.com/style/article/mona-lisa-louvre-cake-attack/index.html

And I guess there’s always a chance this guy is from that other climate activist group that goes around vandalizing high-profile art, and then raving about how we’re killing the planet.