I like this video from Denmark. It shows police officers using hugs to make the point that laws are there to keep people safe. So of course I thought, "could we do this in a library?" I can just imagine a staff person hugging a patron before asking them to speak more softly on their cellphone.
But I do like the point: most rules are in place for a reason, and if patrons know the reason behind the rule - and that we care about our patrons, not just enforcing rules - the patrons' library attitude and behavior might change. Hmm, maybe not. Unless we gave away helmets, too.