I think it would be fair to say that no one whose ancestors arrived in America before 1800 has adequate documentation. For the most part, records were either not kept or they were destroyed. Moreover, in those precarious times it must often have happened that an orphan was informally adopted by relatives or friends and took the surname of the foster parents. And adultery was common enough that there had to be laws against it, so illegitimacy must have been frequent in the days before contraception. But if a person is truly confident that he has his ancestry accurately documented, the argument I would use is that he should consider how helpful it would be to know his haplotype so that those less fortunate might discover if they had the same ancestors. Charles