Why stop there? We should exterminate all life on the planet to restore it to it's pristine state.
I think you have missed the point, the point is the peat bogs have not always been frozen, had we been alive at the time of the last Ice Age we would be hearing an entirely different perspective. It is crazy to think that warming the planet to a pre-ice age state would be bad for humanity. It is clear that biodiversity was much greater in the pre-ice age world and I don't really understand why that is a bad thing. The world will survive ecosystems will adjust and life will thrive as it always has. Either way the warming was already occurring without us and even if we could stop it why would that be a good thing? The climate is not a static system and the end of the world types need to start accepting the fact that we are going to have to deal with a warmer world regardless of whether we eliminate all green house gas emissions or not.