Its hardly about keeping a pure progeny. No progeny is pure in this day and age. Its NOT about being superior to anyone, and its NOT about racism. There is perhaps a small minority who actually thinks along those lines. However, majority of the people dont. The primary reason for thinking along these lines, as I mentioned above, is to ensure a smooth transition for the bride and groom.
What you cook, what you wear, language you speak, customs and traditions you follow, they all differ from caste to caste. And while no food, dress or tradition is better than the next, its true that a bride and groom will have an easier time adjusting to each other, if some of these every day issues are pre-resolved.
But then, there are people for whom the above issues dont matter. Good for them. My point is, just because a person chooses to find an person from within his/her own caste, thats no reason to raise the racism alarm, because usually, its not.
Look Silaaj, I'm sure many people do think along those lines to ensure that the marriage is easier for the bride and groom.
However, this is what I was saying before: if we look in Punjab, even though you have arayin, rajpoot, jatt, sheikh (etc) and many sub-castes, the overall culture, tradition, food, language and customs of one group of people and another group are primarily the same.
You cannot use this **as an argument for marrying **just within your caste. What you're saying is that if a jatt marries a sheikh, it's as if two people from radically different spheres of life are marrying one another, when that is simply not true. Look, marrying outside your country is different to marrying outside your caste. But what you seem to be implying is that the castes in Pakistan have huge cultural differences, and it isn't true!
These days, castes are the stale remnants of Hindu tradition - there really is very little difference in terms of day to day life between the different castes in Pakistan.
Secondly, the way people vociferously hold that: "XYZ-beratheri kay bahir karni hi nahi hai" as if it's an anethema shows that in fact, for most people who advocate inter-caste marriages **only **it is less to do with making marriage easier and more to do with feelings of superiority.
You mentioned your decision to consider caste in your marriage was for practical reasons, and of course, I cannot reasonably disagree with you being unaquainted with your particular situation, but it is not unreasonable to say that for others, it is purely about keeping the children in the caste!