Many converts to an ideology are so taken by their newfound beliefs that they feel a need to convince others. Not only the newly religious but even those who have recently become universally skeptical (i.e. non-religious) are susceptible to this temptation. While many such proselytizers are overly and unduly confident in their new faith, they also mistakenly believe that those who are wrong must be advised of the truth.
Sometimes people are happier living with their false beliefs. If they suffer no harm, and maybe even benefit from their comfortable untruths, then those who wish to enlighten them may even be harming them. Sometimes it is best to let people continue happily in their ignorant lives.
The following Bloom County comic, whose message the cartoonist seems to have forgotten over time, demonstrates the counterproductive nature of the obssessive enlightener. Unable to distinguish between minor and important matters, he wastes his time and goodwill objecting to every untruth he encounters. Oh, how many such obssessive and overly confident people I have “met” online.
Bloom County: The Complete Library, volume four 1986-1987, p. 110 (click on image to enlarge):