The argument from fallacy is a fallacy where one discounts a conclusion merely because the logic structure for the conclusion is a fallacy.
When someone structures an argument in a fallacious manner and comes to a conclusion, this conclusion might still be correct. The only problem is that we cannot know by this alone if the conclusion is absolutely false. The fallacy certainly is enough for us to doubt, but it is not absolute in a wrong conclusion.
Argument from Fallacy Structure
Argument conclusion: A is B and B is A
Fallacy Rebuttal: This is begging the question
Actuality: B is A