"Worry" implies anxiety. I'm not anxious about this. Some of us really enjoy speculating on fabricated world settings. This is part of that. Just as with a good book that has a believably well thought out world setting, and yes that includes applying logic in many cases, some of us like to debate the particulars of our entertainment. It's just a preference thing, no one is forcing those who would rather not "worry" about it to come read all of this.
