Overhauling our energy, communications, building, transportation, and communications infrastructure doesn't happen overnight. It is certainly not cheap. Offsets enable immediate action in the midst of this long-term transition.
In the U.S., political polarization has decimated what had long been the key political constituency in the Congress for environmental action, namely, the middle, including both moderate Republicans and moderate Democrats.
Market-based approaches to environmental protection should be lauded, not condemned, by political leaders, no matter what their party affiliation. Otherwise, there will be severe and perverse long-term consequences for the economy.