Hi Whyizit,
OnTheWay Out has said it for me,
Jeremiah ends the 70 years with the "account against the King of Babylon". Babylon fell in 539 B.C. indicating the start of this 70 year period against "these nations" could have been 609 B.C.
It most certainly could have been 609BCE when Babylon conquered Assyria, most scholars mark 609BCE as the starting point for Babylonian domination, hence Jeremiah 25, 'that these nations will have to serve the king of Babylon seventy years.", implying a number of nations, rather than the nation of Israel.
Alternately, 70 years was the length of time the temple was in a state of disrepair, from the start of the siege on Jerusalem in 589 B.C. to the completion of the new temple in 519 B.C.
Here he has shown two explanations for the 70 year period, both reconcile a 587/6 destruction for Jerusalem. There are alternative explanations for a 70 year period that fit in with scripture.
What the JW's do is to set up a strawman argument. They tell you that that the 70 scriptural period HAS to begin with Jerusalems destruction and HAS to end with Cyrus announcing decree which they guesstimate at 537BCE, yet this is not what the scriptures actually say. The strawman is then set up that if you accept a 587/6 date you are then arguing with scripture, this is then presented as a scripture VS secular debate and ask you which one you should choose, the bible or secular sources.....typical strawman.
The reality is that alternative explanations for a 70 year period do harmonise with the bible and secular sources.
Paul