Pakistan has been found to support terrorist organisations in Kashmir logistically (arms, money, etc) rather than the pure political support BS that the Pak officials always give. The existense of terrorist camps in Pok and Pak-Punjab has been confirmed by other countries as well (even the US).
So, while no direct links between the July 11th blasts and Pakistan may be found yet, it doesn\\\'t make Pakistan innocent as there track record is pretty poor. As long as there are terrorist camps in Pakistan, all terrorist attacks in India would directly or indirectly be linked to Pakistan.
Eventually, the distrust has to go, but, right now there is too much proof against Pakistan for it to even start saying such stuff.
I believe India has to do whatever it can to cause economic, military harm to Pakistan, while at peace. Right now Pakistan is not paying a price for supporting the terrorists in India, that has to change. When both sides are bleeding, maybe, there would be more motivation to compromise. A brutal way, but, more effective, IMO.