People who use views to achieve row security, which is a rather common paradigm, cannot allow users to create functions with side effects.
Can you elaborate? I'm not sure I follow you.
(I'll note anyway that (1) SQL functions can have side effects: CREATE FUNCTION foo() RETURNS VOID AS 'DELETE FROM ...', for example (2) Administrators can always choose to drop pl/pgsql for a particular database, disable it at initdb time, or REVOKE usage of pl/pgsql for particular users.)
-Neil
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