I figure they have so much adversity in their lives, what with overdevelopment and overzealous property owners afraid or annoyed by their presence, that they are free to consider my little space their oasis. They are welcome to eat any vegetation they like and sleep in any nook or cranny they can discover. I only ask that they take it easy on each other -- no predatory killing, at least in my presence.
That last bit was tongue-in-cheek of course, but my main point is not. Humans have taken over practically every green space, and bulldozing more and more of it each year. The creatures have learned and are learning to adapt to living closer to us than they would prefer all things being equal, but we make it extremely difficult for them.
Your yard is lovely. Knowing that the local fauna is welcome there magnifies its beauty, imo. I hope you'll take it easy on the little fox. He has a hard life and could use a break from someone with a heart. 
On edit:
I wanted to add that we also have carpenter bee(s). We're currently pondering the same dilemma you have addressed, and so far have let it/them alone. My research indicates that the males are unable to sting, they just hover around looking menacing. The ladies though can pack a wallup so it's best not to antangonize them. If they decide to nest in a structure other than a dilapidated shed we'll probably rethink our decision.
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