So what happens if a physician marries a bartender? Does that increase their chance of divorce or decrease it? (Maybe a silly question but it would be interesting to dig into this shallow report with a much more critical eye.)
That's only true if they also have a zero percent chance of getting married.
Getting married will still increase the risk of divorce, because it bumps the odds of getting married up to 100%, but two dating unmarried people have, in general, a nonzero risk of getting divorced.