No historian in this field holds that Jerusalem fell in 607. Since you haven't provided any background or context for your question, I can't address the issues that make you ask the question specifically.

The 607 date is only taught by the Jehovah's Witnesses. Why do they hold this view? Because a key tenet of Jehovah's Witnesses' doctrine is that 1914 represented the downfall of Satan from Heaven, the beginning of Jesus' Heavenly Reign, and the start of the End Times. 1914 is 2520 years after 607, which fits with their interpretation of Daniel 7.

However there is no evidence to support this dating. There is overwhelming evidence in support of a 587 date. It can be cross-verified against thinks like the Canon of Kings. The main evidence is a wealth of Babylonian cuneiform tablets. This is not a date that is disputed within historical research on ancient Israel.