I think divorce mediators, like divorce lawyers and judges, have pretty much seen it all. I practiced criminal law for 22 years, and part of that time I was doing stuff in family court (violations of restraining orders), and the hardened criminals were MUCH more reasonable and pleasant than a lot of parties to ordinary divorce proceedings (i.e., where there was no physical abuse). Ugh. In law school I at one time was considering family law practice--I'm SO glad I decided on criminal law instead!