I'm going to take the civil liberty aspect out of this, because I'm just a humble bean counter.
From my perspective, it is better to have more intelligence than less when it comes to looking into terrorist financing. I think the focus should be on determining the false-positive rate. If we have 1,000 filings and only one is credible, that relationship might require too many man-hours and involve too much information being transferred. If the relationship is more like 10 to one, then it seems like a reasonable amount to me.