First, the IOC did not honor the Israelis that were killed by Palestinians in Munich in 1972.
The International Olympic Committee had declined a request to hold a moment of silence during the ceremony to acknowledge the 11 Israeli athletes and coaches killed by Palestinian gunmen in Munich in 1972.
And then NBC did not honor the 7/7 bombings. 7/7 was a terrorist attack in London caused by home grown Islamic terrorists. The Olympic committee had a moment of silence but NBC did not really care. They cut to an interview by Michael Phelps instead.