I agree with you. Many Pakistanis have good relations with Sikhs and Sikhs have good relations with us, despite what their faith teaches.
Sikhism did not begin like this initially, as Guru Nanak was a Muslim who prayed namaz regularly and went to Hajj.
When successive Mughal suppressed them and under Aurangzeb, practically wiped them out, the Sikh religion became very hate-filled against Muslims.
Sikh rule of Punjab, KPK, and southern Afghanistan saw widespread looting, destruction, and abuse of the Muslim populations which lead to insurrections and defeat. Pukhtoons in particular are vilified and blamed for the defeat of Sikh empire.
However, we have to be very clear that India had brainwashed many Sikhs before and after 1947 until now to hate and spread lies against Pakistan and Muslims.
My family were directly affected by ethnic cleansing of Muslim majority areas. Ferozepur, Gurdaspur, Jammu, South Kashmir, Amritsar. These were some of the worst massacres in human history. Sikhs were heavily armed, trained, and had full support of police, while Muslims were unarmed defenseless sheep. Muslim Punjabis (mostly females and children) were paraded naked, raped, and molested all the way from The Eastern most part of Punjab to the border with Pakistan where the survivors were burnt alive and the fumes wafted towards Pakistan.
There is a special place in Hell for those people and they are paying for their sins.
We are going to have to keep this aspect of Sikhism under control, and what better way to do that then have a land-locked Khalistan which is wholly reliant on Pakistan for trade contact with the outside world. Obviously, India will cut off all relations with a newly independent Khalistan.
Sikhs have worked hard to enter and wield influence in both Canada and the UK, where they can easily gain sympathy for their cause from the rest of the Western world.
Lest we forget the greatest prize of all, Cutting India off from Kashmir and allowing it merge back with Pakistan.