Because accepting the potential demise of modern complex society and the collapse of ecosystems and biodiversity world wide and a mass exctinction event because "Fuck it China and India are bad so lets just party until the end." Is fucking stupid.

The proper framing is we need to reduce emissions and so does China and India so how do we facilitate that. The answer is to 1.) Reduce our own emissions to have the moral basis to push other countries to reduce their emissions. 2.) Tax imported goods based on the emissions created in their production. Incentivizing foreign countries to reduce their emissions to be competitive in US markets. 3.) Lobby other countries to do the same using the diplomatic means we have at our disposal.