The press gave Biden lots of grace all through his term and campaign, right up to the debate. At that point it was obvious to literally everyone, and they had to cover it.
Trump gets the same treatment. However trump is different, in that he has always been dumb. Seriously I'm virtually certain his IQ is under 85, even odds it's under 80. So his incoherence is the baseline. And he's spent a lifetime covering for his own dumb statements. He's uncommonly good at masking his ignorance to people. That's why the news doesn't point it out so much. Because it not new, and he's practiced at making plausible excuses.
After world war two, Europe was busy putting itself back together. It left an opening that the US stepped into. And who wouldn't like to be the big dog in the yard.