Why do this to healthy Oaks?

 Judging from the cuts, I imagine a "tree worker" or the owners professional landscapers told the owner the trees might fall if they dont remove a few branches.

Not their trees

 Pruning trees that are not theirs to increase their view.

Top the trees across the street for my view

 Can't see the ocean so I cut the trees across the street. Its not my property but who cares?

High end pruning on a Quercus agrifolia

Hired the right guy for the right price. Why does this happen when I prune large branches he asks?

Just waiting for a nice strong wind to self prune the rest.