It's because the elimination of corruption in people's social circuits is hard, and hard to see, especially when they are doing magic tricks, hypnotising you and escaping justice.
Personality disorders are not understood by enough people for the mass to pay attention to the Warners, who are telling whoever will listen that things are amiss and who appears to be behind the problems.
Warners are also known as prophets, and the tyrants drive them out of society.
Many of them end up being killed and then later people realise, long after the damage is done.