The basic reason why Pakistan is trying to force India to reveal it's 'evidence' is in order to find the sources/modes of intel gathering. If you recall, recently there was a news piece which highlighted how Pakistan has targeted Indian HUMINT in valley.
Our enthusiasm to 'prove' has resulted in this set back. And HUMINT takes time to develop and mature, years at times. It is a disaster to reveal your evidence, much like the Pakistan Nuclear Program intel shared by PM Morarji Desai with Gen Zia, which led to RAW losing a high profile asset in Pakistani Nuclear set up.
That is why, I am opposing any kind of evidence being made public till as such time, operations are ongoing. As the same, the operations, will continue to be underway for foreseeable time period, prudence dictates that we grit ourselves and keep mum.