Thing is, unless you consider everything in life being about politics, this didn't happen because of politics or because of their political careers.

They are acting like they have always been acting. And that was about to clash no matter what. Only difference is that they have now more power and they are being watched and subject of news. Trump throwing a tantrum wouldn't be news unless he wasn't a president and basically the leader of republican party. Without it, it would be considered as acting like trump does and he would be in jail already.

And Elon throwing a tantrum would be seen just childish behavior, but because he is responsible both to his shareholders and US citizens, it's damaging behavior and it's news.

They are not acting like this because of politics. Political power is just another tool to actualize what they have always been about and they are just being themselves.