The YouTube experience has tought me to (generally) appreciate at least some policing/community-guidline-enforcing as a service (not specifically speaking about the local habits).
With a scientific site you must expect to draw a public with low latent inhibition (and some inclination for the empiric method) that might be given to test the waters and possibly limits - so there better be some!
(out of principle (and probably owing to our European upbringing) we are against the capital punishment)