It's perfectly fine, IMO most outsiders don't know much about 'Af-Pak' affairs and history. That applies to Americans public on whose behalf it is being occupied, and also most Indians I've spoken to, with the exception of one or two Indian members here.
These militancies are very diverse, and their leadership often takes help from anti-Pakistani state elements in Afghanistan. This has been the case for a long time. They take help from the Afghan NDS where they can get it. If you think India helping groups like TTP is a mysterious clash of ideology, you should know the taliban and pakhtuns of Afghanistan they represented were literally at war at one time with the Northern Alliance that is in power today, TTP have had no problem whatsoever taking support from them.
Common ideology really isn't needed, a common purpose is more salient IMO. What's the common purpose from India's perspective? Weaken the Pakistani state, the army, undermine security, open a new front, tie Pak army resources in the West. Then there are those blatant cases I talked about, Kulbhushan basically admitted his crimes openly, the reason your government is obfuscating even with consular access is that his case is a very damning one, and very one-sided. I think the government of India has decided to conduct damage control on PR, and is resting assuredly that eventually he'll be released/exchanged.
Then there are the examples of specific terror attacks like those on PNS Mehran, PAF Minhas. These supposed religious lunatics, and rag tag terrorists had the wisdom somehow to penetrate well defended bases within sensitive areas. Then in their incredible intellectual capacity, they sought out high value targets like P-3C Orions in the case of the former attack, and Saab 2000 Erieye awacs in the case of the latter attack. How is it that these TTP militants knew to attack these points and then specifically chose those targets that are Pakistan's biggest force multipliers vs India, and provide unique capabilities, not to mention the highest value targets whereby hundreds of millions of dollars of damage was inflicted? Suicide bombers we capture from years worth of campaigning against terrorism often they are just street kids, refugees, uneducated and lost youth, they aren't even sure why they were doing what they were doing. How is it that groups of terrorists like these are able to co-ordinate and plan elaborate raids on heavily defended military bases and have the knowledge to go after the most sensitive targets? Taliban don't fear PAF awacs, and TTP last I checked don't have any submarines (I hope), these things don't just happen, they were made to happen, and India was the only beneficiary. It's another matter that years after, we've found a clear smoking gun in the form of Kulbhushan.