Just because you understand someone well enough to correct them doesn't mean everyone else will
Just because you understand them well enough today doesn't mean you will tomorrow
We should all be striving to be better than we are, not breeding resentment from contentment
We're clearly not going to agree here. Plenty of people would rather be made aware of their mistakes and that's no less valid than your point of view. Personally I would rather avoid potential misunderstandings than deal with them after the fact. I'm not the only one who feels that way.