What you call "supposition" is simply a veritable landslide of things that took place after Camp's letter arrived at the IRS. You seem to want a sworn confession by Lerner saying that she did indeed target conservative groups for unequal treatment. The fact that Lerner apologized for acting improperly...right before she declared that she didn't act improperly (which is a remarkable rhetorical sleight of hand!) is all the proof you need that this is indeed a scandal.
no, i require actual proof.
What would "actual proof" consist of, Ogi?