Aldo,
 
Let's face it, there is nothing you or  I or anyone else on this list can
do to bring  some order to the  Internet. It was built to  be chaotic and
exceeded its specifications  ;-) There is nothing you can  do about that.
On your list, however,  you can define the policy that  you want, and ask
people who  don't like it  to take  their discussions elsewhere.  And you
have the  means to  enforce it. People  are free to  set up  another list
somewhere else  if they're not happy.  But you'd sooner convince  the NRA
that guns  are bad than  convince the "problem" users  you're complaining
about that they don't have the right to do what they're doing.
 
  Eric