Well, there is a big difference between "most" and "the vast majority". Statistically most men are not elders, so it's not surprising most accused are not as well. I have read hundreds of accounts of Jehovah's Witnesses sex abuse, elders are involved in many cases.
I won't deny that the shape of the issue is different in the Jehovah's Witnesses than the Catholic church, but that doesn't mean that there isnt an issue. One of the problems is this idea that the organization is somehow immune from these problems, the so called "spiritual paradise" the religion claims to enjoy, it creates a culture where people are more trusting and less likely to report problems.
Another issue is that the elders are the ones who investigate, and in too many cases they don't do a good enough job. Lack of any formal training in recognizing signs of abuse or in how to deal with it, a culture of "it doesn't happen here", as you have demonstrated, powerlessness among women, a leadership that steadfastly refuses to change the "two witness rule" are all a factor. This kind of thing was common among organizations in the fifties, there is no excuse for it now.
And if elders do abuse children, who investigate them? Their fellow elders. Do you honestly think that there is no conflict of interest here? It's just human nature to believe someone you know and like and work with. All the factors that make it unlikely anyone will be disciplined for child abuse goes double when an elder is accused. They are just not going to do anything to "bring reproach" on the organization, and an elder convicted of sex abuse would be a major scandal.