Protecting your rights to a piece you have written is only minimally an act of ego. It has more to do with money and livelihood. Your reputation as a writer and thinker and analyst is on the line in your public writings, and that equals money–even if the pieces being written are not directly remunerated. You want to be credited for what you write because you are building an opus, a representation of self as a marketable commodity. You are the owner and operator of the means of production, and you deserve fair compensation for what you produce, even if that compensation is an intangible effect on your reputation as an artist/scholar/writer.

If you in no way make your living from the thoughts you put into words, then I’m not much convinced that you need copyright, or copyleft, protection.