The answer is simple, to destabilize Pakistan through Baluchistan insurgency and now opposing Gawadar as well as CPEC becoming the most headache for India to revive its insurgency in Baluchistan. GB is also the same concern for India and we have been reading about LEAs successful ops in GB area that R&AW & NDS have wast plans to sabotage the peace and CPEC development through terrorism. Indeed, in past Baluchistan insurgency was high but after 24/7 efforts and sacrifices of LEAs, Pakistan has gained a lot against the same through War on Terrorism and still, there is much more to do that we cannot ignore further terrorism by the rivals. There are reasons that Doval has been visiting Kenya and Afghanistan so often yet expending a lot of Indian money and efforts for a cause that is going to be lost very soon as, much of the work is done by Pakistan and very less is left to do.
Indian presence in Afghanistan is based upon only one reason to exploit any weakness against Pakistan first and then China by using the corrupt ANA/NDS. Rest about the so-called Baluchistan Magazines, Radio channels etc are evident that mostly being handled by India for propaganda and lies under the umbrella of media warfare which is the best tools nowadays. Indian denials aside but they have been trying to keep upper hand in such game while on other hand feeling the heat continuously, uses the card of victim as well as trying to portray Kashmir struggle as terrorism to ignore the fact yet world has realized the Kashmir issue and voices raised due to the same that worries India. Rather than addressing the issue or to come with plausible explanation, India as usual trying to mislead and propagate Baluchistan issue which GoI failed miserably in past and will so in future. India is aware of the game that she started and the end depends upon us though for the time being, it will be continued the way contrary to the Indian plans though. The current Indian intention is seems to be the media war against Pakistan due to losses on ground while itself feeling the heat of internal issues from Assam to many other areas that needs a bit of media coverage however, Pakistan currently lacks such propaganda machine though, taste of own medicine has started to develop slowly.
Also, speaking of Gawadar actually reminds that India is not alone in this game but other rivals including few that cannot see firstly Chinese access to Gawadar that themselves, been seeking the contract and limited lease. Also, other few cannot see Pakistan/Gawadar prospering due to the fear of business competition and a direct threat to the monopoly hence, cannot digest it while stoop to such level of interfering and terrorism but through backing India. The desperation of rivals is clear and logical but the day is not far when it will be total peace and Baluchistan along with Pakistan will prosper further and will grow as one of the major business hubs in the world.