Well, I'd argue that they should either all be banned or all be
allowed - with only specific guidelines, if any, on their actual
content (like profanity, images, whatever). Userboxes can serve a
useful descriptive purpose and contribute to the task of building the
'pedia by giving you useful information on the editors with whom you
work. If you say 'Delete all the ones not related to Wikipedia' then
you just shift the arguments into a new pattern without really
changing the dynamic. We should accept that we will never all agree on
what content is appropriate or inappropriate in userboxes, accept that
userboxes have some utility to the task at hand, and agree to squash
future drama associated with people objecting to others userboxes.
They are usually not on the talkpage; they don't interfere with
communication; having a userbox is descriptive and doesn't change who
the editor is or what they believe; you can just ignore them and
ultimately knowing someone is a pedophile is better than not knowing.
Nathan