It’s as if Hannity is saying that because the priest who questioned his faithfulness to the Church has had his own failinjgs, Hannity’s failings are now OK.
It's the standard liberal, not conservative, approach to morality, rooted in the belief that objective moral standards don't exist, so that the validity of any criticism of my moral failings rests, not on the strength of your argument or on moral principles with which we both agree, but on your own moral rectitude. Since everyone is a sinner sooner or later and to some degree or another, any moral criticism can be deflected that way.
Hannity seems to define "conservatism" as "what Sean likes or does".