Best thing non-JWs and ex-JWs could do for JWs is to not look the other way, not ignore the WT, not go off and start their own cult.
But the best thing would be to help JWs see the WT for what it really is. A real-estate holdings and publishing corporation operating under the umbrella of being a non-profit religious organization that uses mind control techniques to provide itself with free volunteer workers labor for its own ends.
To walk away from exposing the truth about The Truth(R) is to allow it to harm others as we were harmed.
If we can do anything to help stop the WT from doing more harm then the right and moral thing is to step up and do so in whatever fashion we are able.