1 I don't like the thing. It says nothing about what happened there.
2 It is an Islamic symbol. So we should ban all crescent shaped object?
3 Today in history
1683 A combined Austrian and Polish army defeats the Turks at Kahlenberg and lifts the siege on Vienna, Austria. The severed head of Kara Mustapha, Turkish grand vizier, was preserved by Austria as a souvenir of the siege of Vienna.
1683 Cappuccino first made. Turks left behind sacks of coffee at Vienna which the Christians found too bitter, so they sweetened it with honey and milk and named the drink cappuccino after the Capuchin order of monks to which d'Aviano belonged. An Austrian baker created a crescent-shaped roll, the Kipfel, to celebrate the victory. Empress Maria Theresa later took it to France where it became the croissant.
" It is an Islamic symbol. So we should ban all crescent shaped object? "
Don't be silly. You sound like a liberal. In this particular instance, you don't see anything wrong with using an Islamic symbol(or reasonable facsimile) to mark the site of an Islamic terrorist attack on this country? Do you REALLY think this is OK? Do you think this design and its orientation are mere coincidences? I don't mean to be rude, but not to see the outrage or the insult by this design is to truly be turning a blind eye. Why not put a mosque at ground zero? Same thing, religion of peace, you know. Or perhaps this display of sensitivity towards the peaceful, misunderstood muslims will quell their desire to destroy our society.