As the sites become older, more and more questions are being answered already. Stack Overflow (and all Stack Exchange sites) have a "strict" policy against duplicate questions, often closing them faster than anyone can react (it seems :P).
However, quite often I stumble now on questions that I want to ask - which are answered already. However, when looking through the answers I don't "understand" the answers, I'd like to question those answers.
"Why is it so?" questions.
Now obviously I could post a comment. - However, those are often ignored by the general public. And with older questions, the one who answered that question may have left the sites already, or at least not care about the question anymore.
So what to do now? - Ask a duplicate question and clearly indicate the reasoning (as I did here)? - Or are there better manners?