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Most are charlatans. There is an occasional witch who uses it as a means of making a living among muggles, but they are quite cut-off from our community and it is kinder not to intervene.
It isn't because I'm afraid of Grindelwald, if that is why you're asking. I mean to go back home someday. It was the rest of it. Our magical community has very strict secrecy laws. Some friends and I decided it was worth the risk to go out by night and repair what damage we could after the German bombs had dropped. Construction spells might not be the most ladylike pursuit, but they did an awful lot of good. But we couldn't do too much - we couldn't risk discovery. And really there is only so many times one can find the body of a muggle child in the rubble without it becoming quite overwhelming and wishing that it was all over and one was anywhere but there,
How fascinating! Is there a reason why it is snakes, in particular?