But… why? Climate change is very much real and even stubborn deep-right voters like my father now ‘believe’ in it. Ok, some people make some cash. But wouldn’t they anyway? I don’t understand this need to keep pandering to a minority and to destroy ecosystems.

Reactionary politics, greed, stupidity. Pick any three.

The government knows it's real, these are generally well-educated people who went to decent schools. But, I would challenge that most right-wing voters know whether it is real. Where I live in rural America the vast majority are pro-fossil fuel, anti-EV. EVs are seen as "gay" or "feminine" by the folks out here. So the choice to use fossil fuels might just be some performative machismo, allowing their pick-ups to output black smoke, make a loud noise and look "tough."

Those are the majority of the Republican voters at this stage. To make them happy you do things like spend millions to tear up infrastructure which challenges their worldview. This should result in increased votes for the current administration at the mid-terms. So even if climate change is a real and current threat, you need to say it isn't to get re-elected.

Many deep-right voters do not believe in climate change. They're a big part of Trump's base.

Which part of trump making billions of dollars from oil oligarchs is the confusing bit? His incentive structure is clear.