There are downsides to insulting and threatening friends and acting like a Mafia don slapping around his goons. You risk turning them against you, for one thing. But if those friends have been freeloading off you for years, well, there are some upsides, too. We're seeing that as President Donald Trump's rough treatment of our European allies has driven them to huffily make steps to actually defend themselves rather than continue to rely on the American defense umbrella.
