The problem is that what they say and what they do are not the same. The elders do NOT warn anyone in the hall that so and so is a pedophile. And if your child is molested and you try to warn others, they come after you. When people asked me where I had been when I stopped going to meetings, I told them why. When I named the pedophile, some sisters actually put their hands over their ears and said "I don't want to hear any gossip." It doesn't get any more stupid than that. If I was telling them their car was on fire out in the parking lot, they'd listen then.
The other issue isn't about "cleaning house". One of the signs that the WT was the truth in the first place was that this "house" was supposed to be clean all the time. If the WT bears fruit that shows it is NOT God's people, then the "cleaning house" excuse is a moot point. I cannot understand why the average JW is too stupid to see this. The very proof that was supposed to show the world that the JW's had the truth is the very thing that shows that they DON'T have the truth. The first century congregation was not riddled with pedophiles.
Trying to reason with the JW's is like "nailing jelly to a tree". You cannot win. If the WT were perfectly clean, they'd say "see, it's God's people". If the WT was full of filth, as it now is, they will say that God is cleaning house. Well, I don't like a God who lives in a pigpen. And I don't think God would approve of any religion that feeds its members such filth. "JW's are like mushrooms. Keep them in the dark and feed them manure."
The bottom line is that with most JW's, there will be no reasoning. They are brainwashed and will die that way. They don't want to know the truth. It would mean throwing away decades of work, time, money, education, etc. They are either too proud or insecure to admit they are wrong and wasted their lives. The issue here will rarely be one of theology or even morality. It is one of psychology. When the WT is attacked or its members approached individually on that basis, then there might be hope of getting some of them out of this lunacy.