I don't understand why this is a problem.
The roof is surely occupied by birds, rats, and mice.
Is the roof designed to include the natural world or not?
Obviously the landscaping was designed to look pretty and win awards, not to host actual wildlife
(This is without any positive or negative value judgement, just an observation that we don't have to reach for "it needs to look pretty" to explain why having foxes on the roof isn't ideal.)