Interesting. Where I grew up (San Luis Obispo county in CA), you'd need an act of congress to touch a mature oak tree–even on your own property. Our church actually had to build around one when they did a building project.

I bet if an entrepreneur or real estate developer wanted to cut down oak trees for a building project, they wouldn't get past the first step in the permit process ... but I guess when city wants them gone, they can run it through a "Development" association and play the disease card.