BECAUSE IT'S A SIN _{(not really, guise duh)} AND JUST PLAIN GROTESQUE/IMMATURE.
This is my opinion, it doesn't necessarily have to be yours _{though it would greatly help this site if many more coughpeoplecough felt the same way...}, so mmhmm pretty much.

Character Abuse: n., adj.
The act of drawing or writing two (or more) characters romantically involved who a.) Have never seen each other before b.) Reside in completely different shows/games/books c.) Are clearly romantically involved with another character from the same show/game/book but are portrayed incorrectly together d.) Are the same person e.) Are a pair of animal/human f.) Are complete and utter mortal enemies.
AND/OR
z.) Drawing characters from a certain show/game/book until those characters literally die from the pure fantadrity _{(yes, fantadrity)} of it all.
In other words, DUMB

If you agree, go ahead and post it in your journals.

Plz.

kthxbai