In the Reichenbach Fall episode why didn't Moriarty threaten to kill Molly Hooper?

This is answered by Molly herself! in the reichenball fall she sais she doesnt count! she says it herself, nobody would think she is important to anyone, especially not sherlock, but she is! we all know that, and it is the only reason sherlock could do the whole fake suicide thing, because moriarty underestimated her importance!

maybe.....but,morirarty probably thought molly wasn't that important to sherlock (though she is) n that threatning to kill molly won't b as effective as others........

Moriarty never bargained on Molly, being a girl, having feelings for Sherlock, a high-functioning sociopath.

Moriarty did not threaten to kill Molly Hooper because he (and everyone else) believed that Molly did not matter to Sherlock, which isn't the case. But he didn't threaten to kill her because he figured Sherlock would be indifferent.