It might be true that it's likely that directors of USPTO are "pro-patent", but OP's point was that the USPTO ought to be less "pro-patent".
Put another way, some government offices are charged with making more of an intrinsically good thing. "Justice", "Education". I expect the leaders of those departments to be pro-justice/education/whatever, just as I expect everyone else to be in favor of these intrinsic goods, insofar as we can agree on their goodness.
OTOH patents are not an intrinsically good thing. There is such a thing as too many patents, or patents issued too freely, or whatever.