Government handouts.
About 70% of immigrants (regardless of origin) vote pro-abortion. Abortion means so little to the Catholic bishops that they are, with few exceptions, campaigning for expanded immigration.
When Reagan’s tax rate cuts were on the table in the 1980 election, the official position of the Catholic bishops’ conference exposed their narrow, self-centered thinking: They opposed cutting the income-tax rates because doing so would reduce the value of the charitable deduction! Think about that: Never mind property rights; never mind economic opportunity; we want government to continue applying coercion to pressure people to give to us.
There are always exceptions, but on the whole Rome has been appointing corrupt, left-leaning, think-inside-the-box Democrats to lead the Church in America. This is why the Kennedys, Cuomos, Pelosi, and others have been allowed to continue the pretense that they are Catholics. The bishops fear the loss of government money, the exposure of their sex lives, and the wrath of the left-wing establishment.
That is a very sober assessment. Boils down to, as all denominations are not innocent, love of mammon.