That's a logical fallasy!

[robvalue]

If an argument contains a logical fallacy, it may produce a correct conclusion and it may not. But there's no way to tell from the argument whether the conclusion is right or not, so it is pointless. You need another argument without fallacies to do its job instead.

A lot of the time a statement is so blatantly wrong that all that's required is to highlight the fallacy. If the poster can be bothered to look up what the fallacy means, they should be able to identify their error. Or ask for clarification if they still can't.

I agree that if a logical fallacy is just declared when it's not clear what the problem is, and not explained, it's not terribly useful. It depends on the example.

On here, I see the same 3 or 4 fallacies repeated endlessly no matter how many times they are identified, spelled out and explained. That means people either aren't taking the time to find out what the problem is and what the fallacy means, or they simply don't care.

Spelling it out every single time, exactly what the fallacy means, to someone who is making no attempt to analyse their logic based on your response gets rather tiresome. It's gotta be a two way process.