Evidence exists from mid 20th century of the damage done to the planet from uncontrolled use of fossil fuels. This is now the consensus view, alternative theories are largely marginalised.
The US is "litigation central", and largely motivated by greed. Righting wrongs, attributing blame and punishment is secondary. Climate change action against the oil companies is about extracting wealth - preferably from the oil companies, their insurers, and finally the government.
Simply because something is bad and/or damaging does not change behaviours. Other examples - smoking, alcohol, betting - have been only partially regulated. Greed, envy, gluttony and the rest of the sin list is as evident today as in biblical times. They are an underlying behavioural constant.
A dictatorship can mandate without protest - although dictators often find it counter-productive. In a democracy protest manifests itself as an election lost rendering legislation ineffectual.
Shouting louder hoping the pubic will respond is futile. It evidently does not work - eg: few can be unaware of the dangers of smoking or excess alcohol, but they continue to consume. Dogmatic arguments risk outright rejection.
A week of higher temperatures and a few house fires will have changed some minds. But today the airports are overloaded, delays in Dover, demand for flights exceeds capacity, etc etc. Evidently vast swathes of the UK population are not persuaded to change their personal behaviours.
Were the general public surveyed with a question like "if you suddenly received £2000 would you (a) take a holiday abroad, (b) change the car, (c) buy some new clothes/TV or (d) improve the insulation in your house" I suspect those honestly opting for (d) would be below 10%.
Sadly things will have to get very bad before behaviours and actions follow - and by then it may be too late.