I can understand the need to trim, trim mind you, branches that dangerously overhang the street or if the tree is diseased. But other than that, there really is no excuse, and yet all around Cairo, you see round trees, square trees and at one point on the airport road, you could even glimpse the elusive lesser-spotted pyramid tree!
If the tree wasn't diseased before, chances are it is now. Birds live in trees. Bugs can make trees sick. Birds eat bugs. Tree is healthy!
Birds can't live in round trees. Bugs can. Birds can't eat bugs. Bugs make tree sick. Tree dies. The moral of the story? Leave the trees alone! We need shade, temperatures in the summer often reach the high 30s C and being able to walk in the street or wait for a taxi under a tree in a bit of shade would make life much more pleasant. Is that too much to ask?