Sorry for the separate comment. Thoughts occurred to me just after
posting.

A good firewall (i.e. one that offers security without interfering with
your intended activity) requires configuration and some decisions on the
part of the user. There's ultimately no way of getting around that.

If a firewall like ufw enabled itself upon installation, it would allow
no window for configuration before its default one potentially shut down
ongoing intended traffic on that system. (This may not be a big deal for
home users, but keep in mind the number of critical systems around the
world that run on Linux. You wouldn't want to make your package a pain
to get going smoothly for admins of such systems.) If you made the
default configuration fairly permissive to try to mitigate that, you run
the very real risk of giving a false sense of security to those home
users---sys admins would presumably know better than to just blindly
trust the default. This is particularly true for (relative) linux noobs
like myself who are not at all eager to trudge through configuration
files. If a firewall enabled itself out of the box, many people would
leave it at the default.

Given that I think the best course is to leave an opportunity for
configuration before it gets enabled, but also make it very clear during
installation that it is being left disabled.

-- 
ufw should be enabled by default
https://bugs.launchpad.net/bugs/382938
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