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"We know that some of you might be thinking, "Gee, when future potential employers are Googling my name, do I really want them to see this rant?" Maybe that's simply good motivation to write something that you'll be proud of. If you think you won't want to stand by your letter years from now, you might reconsider whether you want to post it at all."
My objection to this line of reasoning is the idea that what one is proud of socially, especially in the context of an online community is not neccessarily what one would want to bring into a professional context. For instance, if one were to apply for a job where the person hiring held extremely socially conservative views. While it would be unprofessional in the extreme for them to hold a letter to the editor about my personal views on, for instance, reproductive rights against me, the point is that I don't think that everyone would want potential future employers to have the opportunity to google out their personal views.
Me, personally, I wouldn't want to work for anyone that unprofessional and intollerant, anyways, so, at least at present, I couldn't care less, but your argument seems a little short-sighted to me.