It isn't hard to figure out. Personal animous, political back-stabbing, petty self-interest over nation and loyalty to the president.
Conservatives like Babbin and here on FR, criticize and condemn it when members of their party engage in such conduct and illegal activities, ala Armitage/Powell and Duke Cunningham.
Liberals applaud, rationalize and seek to refine the behavior.....
That's your explanation. I hardly think it will be theirs. :)