If we cannot prove something sceintifcally that does not mean it is not true. It could be due to lack of knowldge or limitations of technology.
During the times of Ramayana, things like paper and writing instruments were not invented, nor were the means available to preserve the manuscripts. The knowledge was passed from one to another verbally and through folklore.
The point is, if we cannot prove something that does not mean it is not true.
Just think about about Physics what was said to unknown 50 years back is proven today. Quantum Physics is a glaring example.
Therefore let us not destroy the evidence, if that happens there will be nothing to prove even if knowledge or science gets more advanced.
