I seem to recall that the guest account ships with it set to 'disabled'

This would suggest that your settings have been adjusted ?
Unless you are just checking through your system ?

The guest account is seen as a problem, because it is there.........Why ?

It is an easier account to compromise, as it is not always checked as carefully as it should be. Any intruder, or 'guest', can see around your system. They might not be able to change anything, BUT, they can look around.

I would make sure that it is disabled, DO NOT use the deny button, until you are CERTAIN of what you will achieve, as the permission set up is 'least restrictive' applies to users,
and 'most restrictive' applies to groups.

[runs off to check]