Legitimate armies wear uniforms so each side knows who to shoot at. Irregular militants and Terrorist groups often don ski masks. Some wear turbans. That in itself is a uniform of sorts. If you are the IDF depicting an enemy force for training purposes, it seems natural to make them look like their likely enemies. Just because some in Israel wear keffiyehs is a lame excuse to put, say, kippahs or cowboy hats on the enemy icons, just to be politically correct.
Saudi-led coalition air strike kills around 30 Yemeni civilians (Reuters)