No divorce is amicable. Some are just less acrimonious than others. Keep in mind that this was a civil marriage, and should have at least the standing of so-called "civil unions" which have been so universally despised in certain intellectual circles. Marriage itself has come to be so devaluated that the state of connubial bliss is losing its meaning.
If it cost a couple million dollars and took six months to a year to get married, and ten bucks and three days to get divorced, an awful lot of marriages would never have taken place. Or a lot more consideration would have gone into them.