Doesn't have to be. OP asked i answered

I don't know how somebody can be content with being irrational, but ok.

I've decided you deserve to understand alittle bit about my perspective. To start you need to think outside the box. Who decides that human beings are more entitled to life over the animal kingdom? No one. We do not rule the earth anymore than any organism that resides on it. The human race is well beyond capacity to the point that we have become nothing more than a plague to the earth. We are a virus that grows and destroys the very host of our existence. We tear at nature and build structures to suit our needs we bring more harm to this planet than any other creature alive and we also pose much more of a threat to it as well. You can cling to your beliefs, values, equations, whatever but in the end we are all subjugated by nature. That is what defines the value of a life. Not us. So when 1 man chooses he doesn't have a right to bias himself on what principles of value that humans constructed - dont be surprised when personal choices are made that defy a man-made system. To word it better - #%*# the system. It's a man-made construct to provide order based on our beliefs of right/wrong. Chew on that its 5am im going to sleep. No im not vegetarian utilitarian hippie any of that.

Not everyone understands everything Call it what you wish

Rational to you, his decision however seems to make total logical ad moral sense to him.

No, it makes emotional sense. Logic isn't subjective.

Then the logical course of action, in your opinion, is to save the stranger then?