Kevin Miller of De Virtutibus has written an excellent response to my earlier quotation from Fr. Brian Harrison on "hunting the heresy-hunters", on the potential dangers of such a venture.
Miller refers to several cases illustrating this danger where heresy-hunting has itself "lead, ironically, to mistrust of the Magisterium", and points out as well that "even professionals can make bad judgements in these matters" (one example being the case of Henry DeLubac, with whom Karol Wojtyla sided against Garrigou-Lagrange in "creative tension").
Thanks for the response, Kevin, and I will take it to heart.
P.S. I'm also both suprised and delighted at this indication that my blog has been discovered! ;-)