Can't you see that Ukraine war is the direct consequence of this decision? To reinforce the statement: all public polls in 90s showed Russians to be very enthusiastic about cooperating with West, they truly believed that the Western model is just and brings prosperity. But it is US' political arrogance and notorious "exceptionality" distracted not only authorities, but people from believing US. People lost trust in US even before propaganda started to arise. Think about it, my American friend.
Of course, living in such a safe island as USA, far from potential enemies and with insanely huge military budget you might think it is not your problem. And obviously you do. But keep in mind that every consequence has a cause.
In 90s US had a unique chance to make this world a better and safer place, but instead US planted seeds of nowadays' wars. Have you heard of Wolfowitz Doctrine (https://en.m.wikipedia.org/wiki/Wolfowitz_Doctrine)? Even written in diplomatic language, it is horrific. Current US foreign policy is no better.
So please don't BS us that US "defends and promotes democracy across the world", because it simply doesn't. You accuse people on HN of "living in cloister", but it is you who transmits US slogans without slightest hint of critical thinking. Dixi