One could focus or make highlight into their bad intent concerning the end times, last days doctrine involving the dating year of 1914.
The WTS at three distinctly different times proclaimed mankind's existence of being 6000 years, once in the early 1900's, again in the early 1940's and finally in the year 1975, even pointing out an actual month of October.
Why was this done ?
It was simply done so to support the doctrine of " This Generation " since 1914.
Is it feasibly possible to do this by chronological calculation of using the bible or outside secular knowledge ?
No it is not so these men were lying and dishonestly corrupt is doing so.
The ending analysis of these men's actions was that they were deviously corrupt religious charlatans (Apostates,sinners)
Bad intent indeed.