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As thenewgreen also mentioned, it sneaks the downvote into hubski. This in itself is contra the philosopy of Hubski if I'm not mistaken. However, I think blocking a user from commenting on your post is a step too far. Downvotes make it more unlikely that other people read the comment, but not impossible. Blocking a user to comment in the first place or removing the comment at a later date, makes it impossible for said user to participate in a discussion.
Another way of maintaining order is by making ignoring a 2-way street. What I mean is this: If user 1 ignores user 2, then user 2 also stops recieving posts from user 1. This way you sort of take away the users right to read your posts (at least directly) and makes Hubski less functional as a punishment for being ignored. User 2 is then less likely to get into the discussion, because it takes a lot more effort to find the post. I don't know if this is a good idea, since it still has some problems. But it is what people do. They don't start to talk to people they don't want a discussion with in the first place, unless the other person talks to them. Anyway, my two cents.