It seems in the nature of things that Evil may sometimes serve a good end!

Yes, it can be the case. We will again quote from The Book of Gwineva. ‘To give man freewill, which he must have to attain godhood, means he must also be given choice and there can be no freedom of choice unless there are pairs of opposites. This choosing from pairs of opposites constitutes part of man’s schooling. Without passing through examinations of free choice man would be no more than an automaton, a mere robot. Thus, while Evil for Evil’s sake would not be permitted, Evil in the service of Good is part of the scheme of things’.