Sure, I agree, it's important to be skeptical. But, one wonders why they would choose to kill him in such an open manner, after he sent an email saying that he was being investigated by the FBI to Wikileaks' lawyers among other folks. Surely he could be dealt with in a much quieter fashion that isn't so open to being discovered. We can also confirm that he was indeed traveling very fast, certainly fast enough for things to go as wrong as they did very quickly.