Should Your Rating Go Down When a Discussion Gets Deleted?

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I lost two rating points this morning; I don't know why. As far as I know, you get one point if someone responds to a discussion you've started, or if you respond to a discussion, or if your comment gets best response from the original poster. If for some reason a discussion you're involved in gets deleted, you lose whatever points you've gained from it. I don't think this is fair unless you're spamming, posting the same comment repeatedly. If you've posted and people have responded, and the whole discussion gets deleted, everyone loses (as far as I know; correct me if you know otherwise). You've done your job: you got people to respond, or you've continued a discussion. Why should you be demoted?