Why not?

Because it would justify any retaliation (including military) from Trump and his sycophants.

Of the people that were of age, were able, and did vote, just over half voted for Trump

Right, over 50% of people who did vote voted for Trump, and unless your arguing that everyone that did not vote did it as a result of voter suppression or intimidation, the % of people that just chose not to vote adds to the % of the population that were fine with this.

If the “popular vote” went to Kamala there would be an argument to be had, but it didn’t. By all available evidence this is what the USA voted for. Why is it the responsibility of other countries to intervene in what people voted for?

assuming voting tallies were accurate.

Provide some evidence that they weren’t and you’ll be far more likely to get support from other countries.

The collapse of the US will not, and is not happening in a vacuum

Correct, and I do not fault any government for not sending money to resistance groups in the US that they could be using to support their own population in the coming economic crash.

This just sounds like more selfish Americentrism, “Why aren’t other countries doing more to help America? Yes, America did it to it’s self, and now if other countries don’t spend considerable resources helping us then they are just being selfish!”