ends Arab worker 'marking': I'm confused. What's the problem? Surely this economises on amunition?

"Israeli security officials have been told to stop making Arab construction workers at the Knesset wear distinctive identifying marks on their hard hats.
Israeli parliamentary speaker Reuven Rivlin, ordered an end to the controversial policy.

The Arab builders had been made to wear helmets with red crosses on top so they were identifiable to marksmen guarding parliament, the daily Maariv reported."