>> “KIDNEY BEANS (and other large beans) SHOULD NOT BE SPROUTED - THEY ARE TOXIC!!” <<
.
Actually all beans are toxic, as are most seeds, because they contain enzyme inhibitors for self preservation that shut down your digestive enzymes. A small amout of sprouted beans or seeds are ok, but sprouts in general are not particularly healthy, although washing will help.
It is my understanding that it is the sprouting itself that neutralizes the problems with the digestive enzymes you mention.
The sprouting of beans and seeds allows access year round to fresh raw salad type food for the providing of vitamins, minerals, and proteolytic and other enzymes. The larger beans do cause some toxicity problems. As you point out, it is VERY necessary to rinse sprouts frequently whenever you grow them.
For a list of enzymes in sprouts see this article:
http://www.livestrong.com/article/217438-list-of-enzymes-in-sprouting-seeds/