The most dangerous of all certainty. Someone driven by a need to do what they think is right and moral. They honestly believe they are helping people in what they do. This certainty blinds those who push it. They can't see anything but what they want, their moral objectives, their good deeds, they're right. Just like those who are too stupid to know they are stupid. Someone with a moral certainty is too certain in their push for morality and righteousness that they can't see the danger and harm it can inflict. Even when the harm is blatant they can't see it.
I believe some members of our government have this moral certainty. They push for public programs intended to help, to make life easier, but in that push they wave aside any hint of harm they may cause because they are right, they are moral, so what they are doing can in no way be bad for anyone. It's like a preacher set in his ways who is incapable of change because it would crumble the ideological and moral world he built around himself. Because of this he can't even comprehend that what he is doing could be negative.
Or they are just assholes and know very well what they are doing.