"In the past, the Trump administration in the US, Putin in Russia, the Xi administration in China, and their many imitators had been decisive and ruthless in locking up their undesirables and in delivering policies that appeal to hypernationalist rhetoric."
I don't recall the Trump administration "locking up undesirables and in delivering policies that appeal to hypernationalist rhetoric". Putin and Xi, absolutely.
The few illegal border gate-crashers that Trump has incarcerated are minuscule by comparison.
You might evaluate the scientific information separately from the political. Almost all scientists are leftists these days. That doesn’t mean that all of their scientific analysis is bogus. Ridicule his political statements - he deserves it, but look at the science presented and judge it separately. If the science is bad and you can demonstrate it, we would all benefit from your reasoned analysis.