SharePoint 2007 - Did I mean to delete that Site Collection Policy?
Throughout the SharePoint UI a user can delete many things. Site collection policies are just one of them. In most cases, when a user tries to delete an item, they are provided with some sort of confirmation dialog box (just in case). In the case of a site collection policy, they are not (Beta2 TR).
This is one of the many items that seem very easy to fix.
Hopefully with the RTM drop so close, these types of inconsistencies in the behavior of the product will be addressed. If not, I hope that they will be fixed with the inevitable service pack that will be made available at a later date.
[EDIT] Well this seems to have happened the morning of my post, so we'll have to wait and see,