Could you elaborate a little on the "justifiable" mistakes you mention?
Creating almost untraceable funds to finance break-ins by Liddy and Hunt?
Hiring an Attorney General ready, willing, and able to control such funds and authorize such acts?
Paying hush money to burglars to buy their silence?
Most people of Stein's intelligence should realize that Nixon's own lack of ethical standards created the Watergate situation. Felt was not responsible for Nixon's failures. Nixon was.
We were a country at war, and the President may have believed the Democratic party was of dubious loyalty. As Stein points out, the killing fields of Cambodia were a direct result of Nixon's impeachment, and millions of South Vietnamese lost their freedom because our Democratic Congress abandoned our obligations to defend them in the mid-1970s.
I don't see how Felt could have kept quiet about the Nixon administration's indiscretions, but what the Democrats did to take advantage of the situation incurred a heavy price. The situation could have been handled differently. Democrats in Congress have a lot of blood on their hands, and it'll never wash out.