I'm glad that you appreciated the talk! Thank you! Actually, it isn't exclusive to psychopaths, it's just that they'll make the decision faster than most "emos" because it's logical to sacrifice 1 to save 4, and accept the consequences, rather than sacrifice the 4 and have to deal with unforeseen consequences. It's just logic.
Now, if the 1 was, say, an extremely rich or famous person, the outcome might be different, because you may consider the possibility of being rewarded lavishly. It's not that the 4 are worth less, morally, it's the lure of wealth...