Just watched JJ Abrams Star Trek again, and got to think after an Old Spock comment (not quite Old Spock's sitch, but inpsiration is inspiration):
Hypothetical situation: you find yourself in an alternate universe - one you know is an alternate and not necessarily an evil twin one; say the difference could be as minor as someone picked a blue shirt instead of a red one at some point. While there, people who mostly seem to be like people you know from your own universe come to harm - do you feel any more sympathy for them than you would just a random person (if so, is it because you could see your actual friends and family in that position? How "different" would the alternate universe need to be for your sympathy to be no more than for a random person?
Hypothetical situation: you find yourself in an alternate universe - one you know is an alternate and not necessarily an evil twin one; say the difference could be as minor as someone picked a blue shirt instead of a red one at some point. While there, people who mostly seem to be like people you know from your own universe come to harm - do you feel any more sympathy for them than you would just a random person (if so, is it because you could see your actual friends and family in that position? How "different" would the alternate universe need to be for your sympathy to be no more than for a random person?