I agree. I have used alter-ego's in the past on all the other forums, but only to talk about a subject that under my current nick I was uncomfortable in doing.
I don't think someone should sign under another nick to ridicule others.
I misread this question. I thought it said, "Are alter egos" wrong? I didn't notice the "to put others down". Putting anyone down is wrong. My comments are not made to do that - just to reveal truth.
I don't have a problem with alter egos but MPD's are a different story!