Question about Debian security policy

[neologix <neologix@free.fr>]

Hi everybody. I hope this question won't be too stupid.
When I perform a standard installation (i.e minimal), the installer installs
many servers, and launches them (like portmap, ssh, exim, etc). Why?
I think that OpenBSD and FreeBSD, for example, don't launch any daemon at all,
or at least prompt you before doing that. There must be a reason, but I don't
see it (I'm not a networking/security guru, so please forgive me if the answer
is obvious).


And I'd like to thank all Debian people: you're achieving an incredible work ;-)