Do you really think that MAGA foot soldiers are the main reason he was never prosecuted? I mean, he also has millions of opponents among the US population -and they obviously have no real influence whatsoever. That's just how it is in a plutocracy: power lies not with the people, but with the elites.

It's true, of course, that he has built a cult of personality around himself, but I think that was only possible because his supporters are so easily influenced. And the media, which he controls only through his connections, plays a key role in this. I mean, it's not like MAGA has its own opinion: they have no values, they just follow. Whether they actually follow the orange rapist or rather the racist organizations that make up this "movement" is questionable, in my opinion. It may well be that they are indeed Drump disciples, but at the moment, they are all pulling in the same direction with their Nazi agenda with plenty of opportunities for other oportunists to enrich themselves while doing so. However, if Drump were to turn against the forces that are also very influential in these circles, it could become apparent that it is less about Drump and more about the political agenda behind this figurehead - also about opportunities for rather mid-level MAGA-functionaries to get rich with this ruse.

That may not necessarily be the case, but I don't think it can be ruled out, as Drump could never have achieved this status without extremely influential help - the man was a B-list celebrity and little more than a ridiculous TV personality, a failure who actually managed to squander pretty much his entire father's fortune through incredible stupidity. I don't think he was clever or influential enough to get to where he is now even halfway on his own. That's why I consider him a straw man and very much doubt that he is actually the one controlling the cult - I consider him merely the face, and in my opinion, that is interchangeable, as MAGA is so completely adaptable in its concerns.

So I don't think Drump would risk a conflict with his elite supporters - he just earns too much from their existing agreement

To put it this way: I consider Drump to be nothing more than an opportunist, and therefore I consider him more comparable to Hermann Göring than to Adolf Hitler. For Drump, Nazi ideology is more of a means to an end, although he is certainly a racist, but even so, if in doubt, he would probably choose to maintain his degenerate lifestyle rather than persuade Nazi ideology with all it's implications (for example he would never turn on Israel because they are his fascist allies even if they are jewish which is incompatible with "pure" Nazi-Ideology).

I cannot see what strategic reasons these might be, or why they would justify the massive costs of invading a NATO and EU member state.

I am, of course, aware that the US president is a megalomaniac. But I think you are thinking too much from a political perspective: the US has been a plutocracy for decades. Therefore, the economy pulls the strings, and I cannot see what the massive losses that an invasion of Greenland would entail would justify - there really is no economic gain and that is all the US is about.

You want a short answer: it would cost the US economy billions to attack Europe, and that is why they will not do it.