Thanks for the link.
http://en.wikipedia.org/wiki/Liberal_paradox
I have read it carefully.
In both examples Lewd/Prude and Alice/Bob
the highest rank is given to outcomes where
one individual enjoys anothers suffering
at the expense of his personal best choice.
Concretely:
a) 'However, he would get even more enjoyment out of Prude being forced to
read it'
b) 'Alice hates Bob with a passion, and she would gladly endure a red
house if it meant that Bob would have to endure his house being yellow. Bob
similarly hates Alice, and would gladly endure a yellow house if that
meant that Alice would live in a red house.'
If society had predominatly such individuals liberalism would not
work for them (and the result would be pareto inefficient
in their case). But that would be good!
If examples proving liberalism is suboptimal
must invent individuals with sadistic tendencies
and then demostrate the outcome is not the happiest
for them - that should be fine.
Consider the following / regarding your reference to 'mental harm':
People may not like to see other
people naked walking on the street. The liberal view
is that people must wear clothes as in a public
place people will experience the sight of naked people
by accident and that is valid mental harm.
On the other hand - Books, Plays, Dramas, Exhibitions
have synopsis. You know what you are getting into.
Mental harm is a valid concern if an individual
experiences something personally.
If individual feel mentally harmed because
someone else decides to experience something
in their privacy - this is again akin to sadistic tendencies.
In other words it seems examples where liberalism is sub optimal
is when considering existence of individuals who get
happy at others suffering or unhappy at others enjoyment.
Regarding poisoned well:
The common good is served by closing access to the well.
Keeping it open could lead to bodily harm
because of accidental use by someone.
Why would a liberal argue against that.
Regards -Rakhal