The issue with that line of argument lies in its glaring double standards: Iran is readily blamed for fueling sectarian conflict, while only a passing acknowledgment is given to the fact that the Saudis bankroll the opposing side. What’s almost always swept under the rug is that over 99% of terrorism in Pakistan stems from groups funded by (and ideologically related to) Saudi Arabia.... yet somehow, Saudis always walk away unscathed, without scrutiny or consequence...!!
And when it comes to India, again the GCC nations tilt noticeably in India's favor. Unlike Iran, they don’t rely on India for economic survival , and unlike Iran, they wield substantial influence within India, which they have never exercised to support Pakistan. Once again, Iran becomes the scapegoat, and Saudi Arabia enjoys immunity....
Now, this isn’t to suggest that Iran harbors deep respect or affection for Pakistan (far from it). But neither do the Arab states. So the question is: why single out one side for blame? The answer may well lie in sectarian bias, a lens that clouds reason and shapes convenient justifications.
And what truly matters (as astutely pointed out by
@Goenitz) is the bitter irony that Sunnis label Shias as kafir, Shias return the favour, and the real disbelievers consider both to be Muslims… and hate them both with equal passion...