That was deliberate. Drawing was/is considered practicing idolatry in muslim cultures. The way around it was/is to draw things in a way that they resembled the subject the least, but still recognizable.
Edit: regarding the religious aspect, modern Muslims still consider pictorial representations of Muhammed as blasphemous and wouldn't produce even a 2D caricature. However the whole "art bad!" thing you see on the news is one of Daesh's (ISIS) twisted mutations of the religion. Not a Muslim, but that's how I understand it.