Painting On Stonehenge For What?

I saw this video somewhere. I am not sure why they spray paint on Stonehenge.
Sometimes, I wonder how in the world they put them there. It's kind of a mystery. I wonder why they are mad at Stonehenge. Religious stuff? I can't figure out why they are spraying paint on Stonehenge. If they are mad at Stonehenge, what could they have done about it in the past? Nothing! Those guys are silly.