Do not. I repeat do not delete user 1.
And I would not ban member 1 either.
As a matter of fact. I am not sure how you can ban member 1!
It appears that you do not want guests to post.
And you have a hole in your permission settings for that forum or multiple forums.
Suggestion is to check the forum permissions for the group "guest"
Depending on what you want. you need to set them to 0. Can view forum,Can reply, post new topics, bla bla
If you would be so kind as to post the URL to the forum.
Some of us could visit the site and see where some forums allow guests to post.
Definition of a guest is a non-registered visitor.
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Blue Man Group