I don't feel it's a complete waste of time. Often a post in response to someone else is not intended to convince him of the facts but to present a factual rebuttal for those that do care.
I know there are people who cannot be convinced, ever. I ran into that on the Yahoo RPTN board. I began posting there that it was a bad investment way back when it was over $2 a share. Some listened and investigated for themselves, some did not.
Some of those that did not listen said I was wrong all the way down and are still arguing, even though the stock has gone from $2+ to less than half a cent! Some of them even post here. { 8^D
As 1manband said, "No one can make them read the facts and learn the truth, but I think at least someone should make the facts available."
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