As a person who uses NS++ and loves it, you do have to acknowledge that you're putting your password in someone else's hands. Afforess even acknowledged that he could pull people's passwords. This isn't saying "Oh my lordy he is going to ruin us, Afforess is evil!" Mad Jack is just pointing out that your password is in someone else's hands and that requires a lot of trust in him. This isn't a "serious" accusation, this is (a hyperbole but still) accurate. The more hands that can grab at your password the less secure it is. People have a right to be paranoid and state accurate statements.
EDIT: Proper tenses >.<