I see 10's of pretty good comments, some reasonable submissions and
one comment that had only reached -2 when the account was killed.
Surely modding to -7 or so would have sent the same message in a better way ?
If someone would persist in behaviour like that you can always get rid of them but this seems to be a bit too trigger happy for my taste.
Also, in spite of being 'dead' ftse continues to participate and as far as I can see behaviour after being banned was pretty much in character with earlier postings.
Take in to account the context of that comment:
http://news.ycombinator.com/item?id=765153
He merely answered the question, maybe not in the most elegant way but that's what you get with subjects like that.