I had the same experience when I took the test the first time. I regret not filing a complaint and doing a retake. I would 100% file a complaint and plead your case.

@AliGoldberg "all" is a sufficient indicator, and "are" is necessary. I use "All cats are mammals" to remember it's a conditional. If you're a cat, then you're a mammal; if you're not a mammal, there's no way you're a cat!

@PedramLovesLSATPrep To me, Main Point is usually opinionated language. Method of Reasoning seems to be describing how they reached their main conclusion.