Wrong site for 'library'
It isn't just the trees. Obama has chosen the prize plum of all locations near the south shore of Lake Michigan for his "museum/library." This library will have few if any books. It will be microfilm, electronic storage.
You could store that in four large file cabinets, not a large chunk of Jackson Park. Instead, the park will become many acres smaller for the glory of Barack Obama.
What happened to all the protests? Bought off? Intimidated off?
This is the Chicago Way.