Because that’s way easier than taking responsibility for your own mistakes? Based on my observations of human nature, that would be my bet.
This thread is downvote hell but I'll bite - blaming the US's extremely well known efforts in destabilizing the Middle East and Latin America for unrest, unstable government and stunted economic development in those regions is very fair. The "mistakes" many of these countries made were often along the lines of electing a left-leaning government or simply becoming stable regional power and interrupting Henry Kissinger's bizarre worldview about the balance of power. After the initial few "interventions" the chaos can feed itself for a few decades.
Oh the irony.
We should really stop blaming the US for backing coups in foreign countries, indeed.
It looks like you've been using Hacker News mostly against the guidelines. Could you please take a read and starting posting more substantively?