Oh for Heavens sake. If you had done any research you would that the broken circle is their because that is where Flight 93 came in.
It's not a "broken circle". The designers called it a "crescent", and that's what it is.
In the US, the major relief organization is the "Red Cross". In Islamic countries, it's the "Red Crescent", the crescent being equivalent to a Christian Cross as the primary symbol of their religion.
But in any event, the motivations of the designers is irrelevant. The Islamic radicals that perpetrated this heinous crime will believe that this is a huge victory. The design MUST be changed, lest we reward terrorism and encourage their continued violence.