Anecdotal: based on personal observation, case study reports, or random investigations rather than systematic scientific evaluation: anecdotal evidence.
You’ve demonstrated that gypsy kidnappings occur, although you haven’t demonstrated their prevalence. Examples from newspapers are just that: examples. We don’t have a dataset; we don’t even have a proper journalistic investigation which would involve at least interviews of all parties.
Ok, let’s build the dataset.
Case 1: Adam Smith, early 1700s. Four year old male. Reliability of story: dubious.
Case 2, NYT 11/18/1906: 14 year old girl lured away by old gypsy woman. Father spends a year trying to find her. No evidence of marriage.
Case 3, NYT 12/14/1907: 8 year old girl kidnapped, by pair of female gypsy fortune tellers. Reward offered. Suspicious farmer spots girl and turns her over to authorities. No evidence of marriage.
Case 4, NYT 5/10/1891: Gypsy woman picks up 6 year old daughter of pastor from their front yard. Kidnap attempt thwarted within an hour by passerby. Nobody caught.
Case 5, NYT 10/24/1904: Four year old boy grabbed by band of gypsies and later killed for unclear reasons. Lynch mob forms but authorities determined to safeguard the prisoners: National Guard alerted.
Case 6, Chicago Tribune 11/23/1909: “CHILD LOVES HER KIDNAPERS Prefers the Gypsy Life Rather than Return to Her Parent… Kidnaped by gypsies more than two years ago, Amelia Johnson, 13 years old, was found yesterday by her father, Ephralm Johnson, of Elisabeth N. J., who has traveled thousands of miles in the search for his daughter.” No evidence of marriage, but it can be reasonably suspected.
Case 7, NYT 4/14/1931; 38 year old woman discovers that she was kidnapped by gypsies in 1898. She was 5. She escaped 7 years later and lived with a family for 13 years. No evidence of marriage.
Case 8: Ludington Daily News - Nov 12, 1931: “Did Gypsy Prince Kidnap 14 year old bride or buy her: Question before police”. Ok, here we have an actual marriage at least, though Blake thinks that it was probably an arranged marriage gone bad.
Case 9: ThinkSpain.com: Five accused of kidnapping a 19 year old gypsy woman. “During her two months in captivity, she was allegedly raped, beaten with dog leads, tortured and only given food and water sparodically.” This followed her breakup with one of the 5 perps. This is horrific, but it isn’t exactly a stranger/danger abduction.
These are not permanent abductions
Case X, NYT 10/21/1874: 4 year old boy kidnapped, but he wasn’t found. This one doesn’t count since the perps weren’t identified. It’s a lengthy and sad story of a family enduring a number of false leads.
Case XI: Abduction and rape of 16 year old girl, not permanent kidnapping. http://paper.standartnews.com/archive/2005/12/14/english/bulgaria/s4648_4.htm
There are more cases, but I don’t necessarily see the pattern that Blake does - though I can’t rule it out either. I don’t see any clear cut cases of a girl being kidnapped in order to be forcibly married, but then again I would think that the girl’s family might want to keep that aspect quiet. There are 3 cases of boys being kidnapped, but the Adam Smith case is old and of dubious provenance and its not clear whether one of the other ones even involved gypsies.
I’d want to see some direct evidence of this gender imbalance. (There is direct evidence of such an imbalance in rural China, for example).
And gypsy clans think this way?
Again, don’t get me wrong. I haven’t come up with any new ideas and Blake’s hypotheses are reasonable. And I haven’t read all the links. But I can’t find a decent set of cases that link a documented kidnapping of a nongypsy child by a gypsy clan to a definitive motive.