I agree with Smiddy and Vidiot both at the same time.
I think Gerrit Losche probably believes....he’s away with the fairies. Some of them compartmentalise.
Some of them, I’m thinking in particular of Stephen Lett, know very well about the child abuse (since he meets with lawyers on a weekly basis), but enjoy the devotion of the followers too much and the cushy lifestyle.
Remember they are also kept busy, busy, busy. Also remember they did not come up with the most egregious rules - such as blood or shunning - So they probably feel as if they’re personally not responsible for watchtower’s worst excesses.