Full Idea
Nietzsche thinks the best way of both joining and opposing a society is to find where it's sick, to be its merciless critic and exposer, and to help heal and renew it.
Gist of Idea
Nietzsche thinks we should join a society, in order to criticise, heal and renew it
Source
report of Friedrich Nietzsche (Works (refs to 8 vol Colli and Montinari) [1885]) by John Richardson - Nietzsche's System 3.3
Book Reference
Richardson,John: 'Nietzsche's System' [OUP 2002], p.163
A Reaction
This sounds like the great Victorian sages, such as Ruskin and Arnold. Christopher Hitchens was a nice recent example. Maybe these have been the finest British citizens?