It says "most prone", not that it will necessarily violate a law. Remember all the other stuff it is lumping in there too.
I could see an Extreme Consequence Bad Luck spell breaking the Law though, as that will cause a massive change in someone. Short of that though, I don't see it for luck-based stuff. It's a lot easier if you are directly messing with the mind, body, or emotions of someone, however.
I suppose a very unfriendly GM might try to enforce that any use of such things violates the law. I don't think that makes sense. Entropomancy is dark stuff, sure, but are many things like summoning demons. A lot of darker magic doesn't inherently break a law, even if the Council wouldn't particularly like it.