The less suffering, the harder it is to deal with?

Ross Douthat wants someone to write a book entitled A History of Theodicy:

Here’s something I’d like to see: A history of popular theodicy, tracing the influence of the “argument from the existence of evil” against belief in God (or the Christian God, at least) throughout the course of Western history. It’s my impression – and it’s only an impression, which is why I’d like to see someone do the necessary intellectual spadework to refute it or back it up – that this argument has gained increasing currency even as our material conditions have dramatically improved; which is to say, the less suffering a particular population experiences, the more likely the suffering it does experience will be cited as evidence against the existence of a benevolent deity.