If you were a psycopath, you wouldn't care about even one other person. Just yourself.
But if you want to keep telling yourself that you would choose the life of ten (or even a hundred) strangers over the life of Your significant other, child, best friend or parent, then be my guest. Not sure if I believe you though.
Ah, that's a different way of looking at it. Guess so. I'm not too well versed in psychological disorders anyway.