Over at the Wall Street Journal,  Nicholas Hahn complains that the U.S. bishops have exceeded their competence by wading into matters such as tax policy and military spending. I am guessing that Mr. Hahn understands taxes have to do with justice -- he probably thinks most taxes are unjust! -- and that justice is a cornerstone of the moral law bishops are charged to uphold.
I am hopeful Hahn is acquainted with the church's long tradition of just war teaching, which certainly proscribes certain military measures as unjust. Mr. Hahn needs a crash course in theology before he criticizes the bishops.