Because they don't have to go into enemy lines, which requires mental training and physical, as well. They just see the invading troops, and attack, rather than planning and attacking.
The government's idea was probably that they'd fit in better, and have an easier time living amongst us and finding work if they adopted our customs, language, and all of that good stuff.
The bad effects this could have on kids, they really don't understand why they'd be forced to adopt these new ways. Mom and Dad have always taught them to do this, but the government is telling them to do that now. They might feel like outcasts, or like their ways aren't welcomed.
