We all witnessed the unprecidented support the Clintons received throughout all the scandals. Hitlery's litany of a right wing conspiracy began to ring true in the minds of too many voters -- it was only politics, she claimed. As appalling as it was, we all saw our fellow Americans put their morals aside and vote according to their pocketbooks. They didn't pay enough attention to politics to know that it was Bush 41's policies that Clinton rode in on, that Bush 41 was more responsible than Clinton for the prosperity of the 90's.
So generally, the public has shown its ignorance in its continued support of the Clintons. And maybe Bush 43'rd doesn't want to tread back into those waters. Maybe he just wants the Clintons out of the picture so that they do not get the opportunity to lie their way out of another scandal or prosecution, casting another dark cloud on republicans.