Why does Proctor say that himself and Danforth are huge sinners?

In Act III, Danforth describes the trial and all that
comes out of it as a "swamp."  This is significant because, by the end of the Act,
Proctor and Danforth are both trapped in a swamp or mire- like condition whereby there
is real significant emotional underpinnings.  Proctor's confession in court is motivated
by a need to end all of the lies and deception that have shrouded the court and its
supposed pursuit of justice and truth.  It is here where Proctor feels that Danforth is
a huge sinner.  Proctor believes that the fraudulent nature of the court is something
for which Danforth has to assume large responsibility.  Danforth's court is nowhere near
the search for truth and justice, as it has empowered people like Abigail to be its
guiding force, with others like Parris looking for opportunities to increase his own
power.  At the same time, people like Francis Nurse and Giles Corey are immediately
punished for simply being.  In the end, Proctor can no longer accept such hypocritical
demonstrations.  While it is evident that Proctor has accepted his own condition of sin,
he is also ready to indict others for their own hypocrisy and inauthenticity, and in
here, Proctor speaks towards Danforth and the court, in general.