That is as much to say as we are all sinners.
A view consistent with Hamlet’s point of view.
It would seem. What with the “We are arrant knaves all, believe none of us.”
But also, also at odds with his point of view, there is his “What a piece of work is a man” stuff.
I wonder if, perhaps, even this worldview is on a pendulum for Hamlet, swinging from, “We’re all the worst” to “We’re all the best.”
He is, after all, a man who has seen someone he loved, and perhaps idolized, emerge from the mouth of hell. (See “sulphorous and tormenting flames” )
A sense that even the best are doomed to the worst must trickle in to the character’s thought processes. He knows his father to have been a sinner but does he know his sins?