THE LOGIC OF VAMPIRES

Why are vampires allergic to sunlight?  And if vampires are allergic to sunlight, then why would a vampire chose to live on a planet where it's sunny for twelve hours out of twenty-four?  Yes, I know that Earth is the only planet that has oxygen and an atmosphere.  However, that won't remain the case for long as long as Global Warming continues to be a possible fate for humanity.  However, since vampires are fictional, why not create an equally fictional planet for vampires to live on where it's dark for all twenty-four hours?  That way human beings can exist without being murdered by a poor misunderstood (Or intentionally murderous) vampire.  That way, vampires can exist without being pushed to a homicidal rage by a nearby human being.  Well, then we have the problem of vampires can only survive by eating (only liquid diets please) human blood.  Gosh darn the luck.  Does it have to be actual human blood?  Isn't synthetic human blood possible?  I mean, vampires isn't real.  Why not create unrealistic synthetic blood for unrealistic vampires to eat (Drink?).  More to the point, has anybody considered making and selling a special form of sunblock that makes it possible for a vampire to walk around in bright sunshine without worrying about bursting into flames?  Oh yes, those are thoughts that I sometimes have in my head.
Here are some photos of film actresses, television actresses and rock stars Aly (Alyson) Michalka and her identical twin sister AJ (Amanda Joy)Michalka.