I do not have my Bible on hand so I do not remember the exact scripture that says "Jehovah will ruin those ruining the earth..." (Isaiah something...)
If Witnesses took this scripture as literal as "Abstain from blood" there wouldn't be very many survivors of Armegeddon. Turning the key to your automobile ruins the atmosphere - we've all contributed to the ruin of our earth unfortunately - not because we intend to really, it's just the way it goes due to modern technology. In all my years I never once remember hearing or seeing a satisfactory answer in regards to the interpretation of this scripture.
Go figure.