mistakeholder 

Someone with a vested interest in a topic but has all the facts wrong.

A mistakeholder in a fisheries management setting cited a number of reasons why increased transparency detracted from understanding a topic.

mistakeholder by jimbonelson December 6, 2018

Mistakeholder 

Self-righteous

He described him as a mistakeholder but the appropriate word already existed in the word self-righteous ... Society is to blame and a lack of love.

Mistakeholder by Insearchoothetruth December 26, 2018