I wouldn’t and I’ve thought of it before.

My feeing is that for the security risk, it isn’t telling us much. We know who we are, in terms of loyalty to a culture and in resistance to an oppressive, culture destroying paradigm. If someone did a DNA test on you after you were gone, would it matter to find out you’re English when you idolized German culture or even if you were surprisingly high genetically Jewish/African/Hispanic? We’re hopefully not LARPing here, our cause is important enough that it shouldn’t be changed by such possibilities.