I suspect there is a political motive here. By attacking Catholicism at its core theologies, it can split Catholics--and thus, split the Catholic vote. The goal here is to create conservative-voting Catholics. They take a loose reading of "subsidiarity" and run with it. They know they don't have to win the theological arguments... all they have to do is generate enough doubt to create an impression of a conservative-friendly Catholicism.

Look what they did to the Protestants and Evangelicals when the "religious right" was created. There is an atempt to do something similar to Catholics. Entire denominations are still reeling from the painful wounds that movement inflicted.