It's not easy. You can say many other things in anger, what purpose does utterance of divorce serve in the context of an argument? Secondly, the man has to utter it three times to end the marriage, and that is far from easy. The woman is the queen, she does not deserve to be threatened with divorce. Either the man wants to live with her or he doesn't. My wife and I have major arguments, yet it is possible to express one's anger in some other way than uttering the words of divorce, especially if you think about what's at stake.