If you think that is just fine, you are utterly lacking a moral compass. The fact that you also have no idea of what the Geneva convention permits or doesn't permit is a comparatively minor consideration. You are no better than those thugs who whio attacked the Arab kids. Same mindset.
Nusra Front in Syria says it has detained U.S.-trained rebels (Reuters)
from the article: Two defendants in Jerusalem lynch of Palestinian youth get plea deal