Rainer,...
I guess some of that could be possible, and it seems to work pretty good for you I guess, but I just get the "willies" when you tell everyone to simply throw their kings together without also adding in all of the conditions and extra details that you might take for granted when you do it. Without knowing all about the other person's king husbandry, I don't think I would feel comfortable about advising this to just everyone though.
Again, not saying it doesn't seem to work okay for you, I just don't know about recommending the same practice for everyone.
Sort of like what I might do with a power saw. I have done things with saws that would cut off most other non-carpenter people's fingers and hands off(or even worse)..LOL! I do it, because I know exactly what I'm doing, but I certainly wouldn't recommend that someone off the street hold the saw upside down with the blade guard wedged open with a shim while pulling the saw towards their face like I have done before for certain cuts..
I guss you are right. i would think it has to do with a smidgen of common sense. For instance, is it worth mentioning not to throw two starving snakes together? Would you put two starving dogs togther that hav'nt eaten in 10-15 days?.. or any starving animals together of the same species? Frogs, lizards? How about a group pitbull and cats??, heck even humans will canniblize if there is no other resourses. But i don't think anyone wants to eat their spouse. Well maybe they do 
Also there is the scent of a freshly killed mouse smell on a snake that has just eaten and then introduced into a hungry snakes cage. Should have one of thoese maufacturer signs on them saying ^^ DANGER***WARNING** all over it. Kind like gun manufacturers started putting labels on thei guns which say ;;

Maybe we should tattoo all of our snakes with a warning too.
all these things considered, I guess you would have to work pretty hard at to get one to eat another. Just like shooting yourself in the face with a gun. But I guess nowadays we need to tell people everything NOT to do. Which is plain obvious to some.
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