Your standards for tangents that result from normal discussion in a thread seems to be they are ok, as long as you agree with them. The minute you disagree you criticize the post. The point was this was replying to a grossly erroneous "fact" (I should probably call it a fiction) that was posted in this thread. Just because such errors are off topic doesnt' mean it should be fine to post the error and not fine to correct it. Just because such errors support ones world view doesn't mean it should be fine to post the error as truth and not fine to correct it.