In general we do not expect to remove any comments. There are a few exceptions to that and comments will be removed if they:

1. encourage obscenity and mindless abuse, including personal attacks.
2. Are racist, sexist or homophobic.
3. Contain views that other users may find extremely offensive or threatening.
4. Contain comments that may put us in legal jeopardy, such as potentially libellous or defamatory postings.