after years and years of seeing rock solid couples (you've seen them...you would NEVER suspect in a million years that certain couples would part ways) split and have awful battles with community property issues
Totally agree, but this kind of stuff always
happens. Its a risk just like all the other risks that he is supposed to be helping his client manage. A financial advisor can't base all if his advice on just this one risk.
Like slim thug pointed out, he could have just added a disclaimer, or if he thought it was a high risk, suggested the couple draw up a contract or something. But to tell him outright that its a bad idea just because the two might divorce is bad advice IMHO.