High level international politics is like playing simultaneous chess games against dozens of opponents, while blindfolded and on sedatives. Donald Trump thinks the game is tic-tac-toe, and even in that game he only thinks about his first move. Hence the way his rallies told us that only he can fix everything, how his extremely simple solutions will fix everything, how he is the smartest yam in the whole wide world.
He cannot see the complexity of the game, or perhaps he doesn't care. Its agony for all of us who do see that complexity, as we know what could happen after Trump's boisterous first moves.
To give you just one example, Trump's policies toward Mexico cause Mexicans to react:
Some lawmakers were alarmed by reports that Mexico is exploring a deal to buy corn from Brazil and Argentina instead of the United States to retaliate against Trump’s threats of tariffs on Mexican imports.
“We’ve got plenty of history of when we do something some country doesn’t like then they retaliate against us,” said Sen. Chuck Grassley (R-Iowa), a senior member of the Finance and Agriculture committees.
Imports from Mexico and exports to Mexico are not independent of each other. Trump cannot yell at the president of Mexico and expect no negative consequences from that, and what he says to Mexico other countries will also hear. This changes plans and policies everywhere, and I, for one, would like a president who understands that.