Blessings are on the head of the righteous, but the mouth of the wicked conceals violence.
Proverbs 10:6

The righteous don't need to hide their actions. Everything they do, they can do in the open without fear, assuming the wicked don't occupy the majority of positions of power. The wicked, on the other hand, hide everything they do instinctively. They lie, conspire, sneak, censor, accuse, and threaten to hide their activities.