I'm in the process of whittling down the accounts that are being created automatically during a system installation. This is for compliance reasons mostly, auditors want to see justification for every account that exists on the system. The system is a fairly basic install with ntp & named added. Here are the accounts I feel safe deleting to start with:

games
uucp
ftp
wwwrun
news

Are there any good reasons to not delete them? What other accounts are safe to delete?