The accession to power of the likes of Donald Trump is by far the greatest catastrophe — moral and environmental — to befall the planet since WW II, perhaps ever.
With control of the White House, the Senate, the House of Representatives and the Supreme Court all ceded to Trump, all the US consitution’s intended checks-and-balances are check-mated and Trump’s malign destructiveness is unchecked.
Since the free and open media helped get him there, it is unlikely that they will be able to constrain him now.
Bottomless ignorance, incompetence, pettiness and malevolence have been empowered limitlessly.
And by 2020 immense, irreversible damage will have been done.
Even a violent revolution could not prevent it, just make it worse.
Only a quick impeachment from one of the pending court cases against him can mitigate the damage (though Pence et al are not much better).