AH I got it - but \I think that is exactly the issue - the only way to get to the tag page is via a topic with the tag attached. If there is no topic with the tag attached, how do you get to the tag page? There seems to be no way of getting there via the tags menu…
(and yes, deleting the tag is just fine once you are on the tag page.)
I think what I would expect is that the tags would appear listed on the tags page (rather than only those that are currently set into a tag group)