Beliefs that evolved in one climate might not fair well in a different environment. Beliefs adapt or they become extinct. It’s not so much deceit as its the natural order of things, change and how people react to it.
That is important. In some ways I believe that the LDS and JW’s are alike in their approach. They even bring up some good points. The problem is that fewer and fewer modern westernized people really care who is winning in the “which church is true?” debate. The society is moving towards a “spiritual but not religious” mindset.
The LDS church is at the same time very adaptive and slow to adapt. On one hand, almost anything can change if we receive a revelation. One the other hand, it takes a revelation to change almost anything. 