The message attached below isn't displayed well by Gnus.  I suspect
that it is incorrect MIME.  Unfortunately, I'm getting a lot of
messages like this from a certain source who can't change the software
which generates them.  So I'm wondering:  are they in fact incorrect
MIME, and is there a way to get Gnus to detect this and display them
properly automatically?

The messages consist of a multipart/related with
type="multipart/alternative" and two sub-parts.  The first subpart
(part 1) is a multipart/alternative (which is correct) and the second
(part 2) is an image (replaced below by a text/plain part).  The
enclosing multipart/related shouldn't be an alternative; I want to see
one of the first two parts and the last part.  If I hit `K m', Gnus
somehow can tell this is what I want and fixes the message.  I'd like
this to happen automatically.

By the way, before being fixed, `K b' only shows one button, which
corresponds to part 1, the alternative.  But I never see part 2.  
`C-u K b' fixes this, but shouldn't I see an alternative to part 1
with `K b'?

`C-d' on the message shows the correct heirarchy of parts.

Here is the message: