Why wouldn't he, for example, use any of Luke 13? It's because it doesn't fit in with his agenda:
There were some present at that very time who told him about the Galileans whose blood Pilate had mingled with their sacrifices. And he answered them, “Do you think that these Galileans were worse sinners than all the other Galileans, because they suffered in this way? No, I tell you; but unless you repent, you will all likewise perish. Or those eighteen on whom the tower in Siloam fell and killed them: do you think that they were worse offenders than all the others who lived in Jerusalem? No, I tell you; but unless you repent, you will all likewise perish.”
Here Jesus is saying the exact opposite of what Dawkins is trying to suggest (and indeed the Rev). The point is that in a general sense our mortality is a result of our wrongdoings BUT that doesn't mean we have the right to label people as worse sinners because they have suffered more.
Or how about John 9? Why didn't Dawkins make reference to John 9?
As he passed by, he saw a man blind from birth. And his disciples asked him, “Rabbi, who sinned, this man or his parents, that he was born blind?” Jesus answered, “It was not that this man sinned, or his parents, but that the works of God might be displayed in him.
Sorry Richard, but you're wrong again, and here is the reason why faithheads who weep Christian tears are indeed living out their calling. The Christian response is to weep and mourn over suffering, but it goes further than that - to try and bring comfort, help and support. Jesus healed the man and demonstrated to the discipes how to bring light into the world.
This is where Dawkins' comments stop being an interesting argument and actually become distasteful. It is widely acknowledged that Christian aid agencies are amongst the most efficient, caring and quick to respond NGOs you can find. It is also a fact that the Christian faith is all round the world motivating millions of people to offer aid in whatever means they can. What kind of person would sneer at that?
Finally, a quote from Rabbi Jonathan Sacks following the Asian Tsunami:
The religious question is not 'Why did this happen?' but 'What can I do to help?'