It Takes Two Baby
Say you had to create a second you, from an alternate deminsion, in
order to defeat an evil creature that threatens us all. That would be
cool. But then once the defeation was over I'm sure you'd have to
destroy either you or the alternate you in order to protect space-time
from colasping in on itself. Could you do it, and how do you decide
which one to destroy? For me that's easy. I'd kill my alternate self,
becuase everyone knows that alternate selves are always evil. And who
wants an evil version of themselves running around ruining space-time,
not to mention soiling their good name?