From my own experience and having read dozens of accounts, a lot of factors determine who gets disfellowshipped in cases of serious sin, (or what the Watchtower considers serious sin). The elders can and do take a lot of factors into consideration, and do use their own judgement when determining guilt or innocence, so it's ridiculous to maintain that their hands are tied when it comes to child abuse.
The Watchtower knows that their policies can and do enable pedophiles to freely operate in the congregation, and they don't care. The scriptures they use to defend their practices are very much open to interpretation, the bible doesn't even talk about "judicial committees" and the word disfellowship mentioned. But the Watchtower stubbornly refuses to change, they would rather continue to see children abused than admit that there might be a better way to do things, when the reality is that they flip flop on doctrine constantly in other matters.
Common sense and basic human decency dictates that you don't put children at risk, anything else is contrary to the very basic biblical command to do unto others as you would have them do unto you. The elders who become aware of a pedophile can take steps to protect their children, but they leave other families vulnerable, how could that possibly be considered right, or moral or Christian?
Rather than stand on a rigid and debatable interpretation of a few scriptures, the scripture the Watchtower should be concerned with is Matthew 7:21-23
…21"Not everyone who says to Me, 'Lord, Lord,' will enter the kingdom of heaven, but he who does the will of My Father who is in heaven will enter. 22"Many will say to Me on that day, 'Lord, Lord, did we not prophesy in Your name, and in Your name cast out demons, and in Your name perform many miracles?' 23"And then I will declare to them, 'I never knew you; DEPART FROM ME, YOU WHO PRACTICE LAWLESSNESS.'