> Sure it was striking given the position
That's the clue to the outrage. It was well known and enjoyed by the general public, and a pair of morons decided they were going to ruin it for everyone, for no clear reason.
> Compare far less outrage when a restaurant chain chopped down a 500 year old tree.
It's a crime, hopefully it gets prosecuted, but it wasn't as iconic.
I don't think there's a mystery here.