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Radical Christians of both the left and the right struggle mightily with the challenge of being Christians in the world but not of it.  They have more in common with each other than with the great mass of Christians in various middle positions.  I would love to know how Fr. Berrigan would have reacted to Rod Dreher's "The Benedict Option";  I think he would have been sympathetic to it.
You insist on describing Fr. Berrigan's teaching as "foolish"; but he took the Gospel seriously, preached and practiced it faithfully, and suffered for it.  With St. Paul, he was a "fool for Christ's sake."  Not bad company.