I remember sometimes not using great judgment at 24 (Paul George). It's a condition he may outgrow.
I think Rice didn't make a bad decision, I think he actually made no decision. He acted impulsively. It is scary when a strong man (as many men do) reacts to his own anger by aggressing violently (over-reacting), even when the person they are aggressing against is significantly less powerful. To me, it isn't that she's a woman, per se -- I'd feel the same if he did that to anyone with whom the power differential is significant. Ray needs to re-train himself to react with restraint (meaning he needs to activate a thought process before/when emotions rise). If attacked, the powerful individual should first defend (block), walk away, and then (if necessary) safely restrain the other individual. If your anger/rage mechanism is tapped so easily, you've got a problem that will eventually result in someone being seriously hurt (perhaps a child next time). Rice could easily have done lots more damage than was actually done in that elevator -- he, and she, are lucky.
That is not to say that I that I think it's easy for some people to control their own rage. This is especially true if they, like millions of Americans, were either victims of, or witness to, domestic violence. Models for how to deal with anger are important for children, and lacking such a model can have very bad results. I definitely have some sympathy for Rice -- he probably does feel bad, and perhaps he is shocked by his own behavior. I hope that he realizes that alcohol (which they've discussed played a big part in this) can further dull a person's ability to manage rage. But the answer can't be as simple as stopping the drinking. He probably has to dig deep if he's going to avoid ever losing control violently again.
I hope he does work hard and get the right help -- some perpetrators actually do stop. If she is committed to work with him, live with him, have their children live with him, all I can say is that I hope it never happens again.