Because he wrote history after gathering information from Hanuman, Seeta, Rama etc. Nala intelligently filled up the gaps in that row, with wood and made a temporary bridge.
Those were true characters The Govt should not say that the Ramayana is not a history and Rama never existed. BJP, VHP, and others should also not say anything untrue. Why should they hold that the Setu was built with stones?
It was painful to read the news on 13-9-2007 that the central Govt.
of India submitted an affidavit in the Supreme court that there was no historical and scientific evidence to establish the existence of Rama and the Ramayana.
Why should they suppose that the stones floated on water?