Just take it at face value. They are out there to teach their children a language. Next you'll be questioning the fact that their children are learning Mathematics, arguing that they do so as to calculate the trajectory of a katyusha rocket. People get a hold of yourself. Everyone wants to ensure a favourable future for their children. Palestinians are no different then any other human.
U.S. confirms ISIS computer expert killed in air strike (Reuters)
from the article: Hamas leaders to begin teaching Gaza children Hebrew