Your God is Death:
Reason per se didn’t lead to the death camps. Rather, I’d say reason divorced/dissociated from morality led to the death camps,
And I'm not sure it's is fair to place the majority of blame on The Enlightenment for that travesty.
I'd blame Christianity for not only raising the bar on moral expectations without teaching people how to COMPETENTLY live up to those high expectations, but for also creating a religion that AT ITS CORE encourages their DISSOCIATION.