Do you realize that Pakistanis have a favorable view of Iran in that poll because they believe in the concept of Ummah and not because they like Iran? Do the same poll about Iran versus Saudi Arabia or Iran versus Turkey and then tell me the answer.
First. PEW is very reputable organization and this poll is part of a series of polls about global attitudes they have been conducting for years.
Second, if Pakistani attitudes towards Iran were simply an extension of Pakistani views towards the 'Ummah' they would be the same for every single Muslim country - they are not, there are variations. And even if the Pakistani views are the result of the concept of an Ummah, the fact remains that a majority of Pakistanis, when asked specifically about Iran, said they had a favorable view of Iran, which debunks your claim of "Anti-Iranian sentiments in Pakistan are deeply rooted and the reason for that is the sectarian fiber of the Pakistani culture and society."
So again, you need to retract your earlier statement since I've offered at least one credible source refuting your claim while you've offered nothing but your personal anecdotal experiences to support your claim.
Referring to your own argument, what are your nuclear weapons good for if you think you can't defend your territory from US airstrikes? The US doesn't dare to bomb Iranian civilians and we don't have nukes.
The issue is not Iran vs. Pakistan. You brought up "brotherly relations". If you had brotherly relations with us, you would've helped us arrest Rigi and Jundullah terrorists. You didn't do that. You said you could take care of the problem on your own but never did so. If you believed in brotherly relations, you would've secured the release of our soldiers currently captured by Baluch separatists inside Pakistan. This is an ongoing situation.
Pakistan doesn't have a magic wand, but you could give permission to our troops to chase those terrorists inside Pakistan. I'm sure if Saudi Arabia or Turkey had asked you for permission, you would've given them that. If you had done that, we would've returned your favor today that Baluch insurgency has become an issue in Pakistan. You didn't see this day coming. Did you?
We have always blamed Saudi Arabia, UAE, Israel and the US for supporting terrorism in Iran. We have officially blamed them. However, Pakistan has been used as a medium for all terrorist attacks in the Iranian side of Baluchistan.
Our nuclear weapons are a last resort. We have no enmity with the US unlike Iran. Pakistan disagrees with US policies in the region and there is a lack of trust and both sides have different opinions about what they get out of the relationship respectively, but there is no existential or civilizational hatred at the institutional level. But in any case - our decision to not escalate into a conflict with the US and in my view the correct thing to do at that point in time.
And Pakistan has assisted Iran with Rigi and Jundullah - for someone who was obviously living in the UAE and traveling from there, Iran seems to blame Pakistan a lot instead of the Emiratis. Like I said, you yourself said that he was caught traveling from the UAE, so take it up with them, not Pakistan.
I've also explained to you (and you likely already know) that Pakistan has been fighting an insurgency in Balochistan for years. Kidnappings have occurred in Balochistan as have attacks on civilians and security forces. So if we're struggling to control these groups ourselves, what makes you think that Pakistan is not cooperating with Iran? Can you point to any credible evidence that supports this Iranian claim that Pakistan has not cooperated with Iran wherever it could?
Do you really think that Pakistan has a magic wand to answer all Iranian requests and fulfill Iranian demands when Pakistan herself is struggling to defeat the insurgency in Balochistan?
Also, are you aware that the wikilkeaks documents had US diplomatic cables outlining conversations between the Afghan President and other Afghan officials and US officials indicating that the Afghans had deliberately given shelter to the leaders of terrorist groups in Afghanistan? Iran needs to redirect her focus towards Afghanistan, instead of blaming and scapegoating Pakistan.