Of course the Catholic League would be ok with Mel Gibson's apology. They are not a Jewish group dedicated to fighting anti-semitism. CL is an advocacy group for Roman Catholics. They're doing their job and ADL is doing theirs.
I think you did no read the article, it addresses your point with examples.
Like the NAACP, the ADL's primary mission is now raising money and supporting liberal causes. At one point, the ADL was a good thing. But since it's been turned into a conservative and Christian bashing platform for leftists, I believe that it's actually contributed to anti-Jewish feelings and resentment. I have no doubt that part of Gibson's outburst was due to the unrelenting bashing of "The Passion of the Christ" by Foxman and other leftist (supposedly) Jewish groups.
Mark