Prometheus was the oldest tree, killed by a core sample.
Tree of Ténéré, the most isolated tree in the world, felled by a drunk driver. [1]
The Senator, the biggest cypress in the world was lit afire by an arsonist. [2]
Kiidk'yaas, a rare golden spruce, was felled by someone protesting logging. [3]
I also remember reading about the 2nd (largest, tallest, widest?) tree in the world being lit alight by someone smoking meth in its branches, but I can't find the source or name.
[1] https://en.wikipedia.org/wiki/Tree_of_T%C3%A9n%C3%A9r%C3%A9
Edit: They did! [1]
[1] https://www.hakaimagazine.com/article-short/film-review-hadw...
For good reason. People suck.
https://jennafeld.files.wordpress.com/2014/08/tree.jpeg (Link to the image on a random person’s WordPress site)