I would like to think that none of the JWs I know could do this... but, the majority on the board here agree that the JWs are a cult. I've seen literally thousands of posts listing reasons why JWs are a cult. How they fit into the cult mentality.
More than once, I've heard the comment that an elder said, holding up a black Bible, "If the Society said this is green, then it's green." Knowing this, I don't doubt that the WTS could sway a large number of them to actually kill people before the big A. And, of course, they would never come out and say to kill exJWs and worldly people directly, but rather allude to it so they could deny it later if necessary, a la 1977.
Just my two cents,
CountryGuy