I once read an article on the methodologies employed by the Tableeghi Jamaat to ensure full conversion of the Meos in Mewat to Islam in pre independent India around the 1930s IIRC , which was the reason the TeJ was founded in the first.
Now the original Meos from Mewat were essentially Rajputs who were nominally Muslims converting under pressure during the period of the Delhi Sultanate essentially pre Mughal India.
They followed what our secular jamaatis refer to as syncretic practices which among other things involved celebrating Hindu festivals , abstaining from beef & more to the point pertinent here abstained from consanguineous or cousin marriages.
TeJ full conversion to Islam essentially involved coercing them to consume beef give up Hindu customs & traditions & more to the point here engage in cousin marriages , although that article mentioned the TeJ missionaries didn't report much success here .
IMO back during the mediaeval period the conversions of the Hindus in what's now Paxtan especially Paxtani Punjab was similar which is to say they were nominal.
However the role of the TeJ was played by the various Sufi khankahs out there which ensured that in order to be distinguished from the native Hindus & be identified as completely Muslim they would've been coerced into similar practices even then .
Since the ordinary Punjabi Mussalman came mostly from the lower strata hence class & caste , their options would've been that much more limited when it came to seeking marital alliances.
Hence while previously they followed the gotra system since an equal number or maybe more of their sub castes would still be Hindu at that point in time quite obviously there would a paucity bof choices. That coupled with their conversion to a new faith which encouraged such consanguineous relationships must have fixed the deal for them.
What we're seeing today is a continuation of those "traditions." Of course there are plenty of other reasons these relationships occur as the video highlights for the phenomenon is not just restricted to Paxtanis in Paxtan but Paxtanis in the diaspora also mostly follow this practice.
As good neighbours we shouldn't be ridiculing them but encourage them to follow their own customs & traditions particularly if we want this thread to flourish. By making them aware of their situation a good deal of them would feel awkward & will actually seek marriages outside their families.
Then one fine day in the future they'd actually start thinking & behaving logically. That would be the dawn of Naya Paxtan. It's a frightful thought . Why are we so determined to bring down the axe on our own feet by creating competition for own selves ?!