They are descended from an untouchable caste back in India. They weren't sending their best.

I can believe the numbers. Growing up, they'd drop out of compulsory education around 10 or so if they even showed up to begin with and nobody even tried to get them to come back. Probably because they were a danger. The mixed ones maybe made it to high school.

Generally, though, they show some ability to follow some basic rules. While they are often involved in killings it is mostly Gypsy on Gypsy violence.