But so far, conservatives have been silent, perhaps because Klayman has proved remarkably effective at abusing the people most right-wingers dislike.
Conservatives have been loud in their protests against Klayman. 
mnli hypothesis: Conservatives have been loud in their protests against Klayman.  premise: But so far, conservatives have been silent, perhaps because Klayman has proved remarkably effective at abusing the people most right-wingers dislike.