Now today, it's not the same calculation. Nations like China and Russia and South Africa and Germany and many others are no longer weak and poor in a way that you can behave against them like the same big brother after WWII. If your power only depends on the weakness of others, your arrogance will isolate you then kill you as fast as you can't recover even after a thousand years.
That's what makes this policy dangerous to the whole world. Before WW2, many countries weren't weak. They became weak because of WW2 and US was intact which made them more powerful compared to others who were destroyed.
After WW2, this kind of behavior became a policy in Washington. This is why they are trying to repeat history by starting "proxy wars" and watch everyone else be destroyed while they remain intact. Take the recent US regime's act of aggression toward Iran on June 13. They were trying to hide behind Israel while they continued bombing Iran but from early days Iran started hitting US directly to the point when Iran directly bombed the US regime's Central Command and right after that Trump started begging for a ceasefire!!!
The reason was exactly what I explained, they want to stay back and watch everyone else be destroyed while the remain intact themselves. The moment they realize this is not 1940's anymore and even the US mainland is an easily reachable target, they back off with their tails between their legs

But that's another problem the world is facing, nobody dares fight those behind the wars. Everyone just fights the proxy. Like the Russians... for 3 years they haven't even shot a single bullet in US direction... enough said.