The reason why JWs deny those flip-flop doctrinal dogmas is because those changes are not really relevant to their day-to-day life, they exact zero effect on any major decision made by an average JW. Most of them see those explanations as another evidence of the GB intellectualism and a manifestation of divine backing and thats all. No meaning is attached to it beyond the platform.
Recently, I have been expressing my doubts to a number of JWs and quite a few share the same sentiment that all the recent flip-flops are becoming unbearable, some lament over unnecessary emphasis of scriptures with questionable applications, many are troubled by the willfull manipulation to suit doctrinal line and the cunning explanation to keep up the pace of extortion. but what would they do?