1) They have a constitutional responsibility
2) Traditional oversight clearly won't be effective
3) There has to be accountability for Trumpian behavior
4) Televised hearings and testimony will better educate the public
6) The voters Democrats fear might rally to Trump are going to rally to him regardless
7) If not this, Trump will find something else to rile up his base
9) Properly conducted, Democrats will again be seen as the adults in the room and Republicans as slavish ideologues
10) It will drive Trump ABSOLUTELY nuts!