Their track record for supporting brutal dictatorships in America, as well as Africa and Asia, as long as they aligned to their economic interests, is very well-known. Just Google Operación Condor.
And I agree, regardless of whether they lean right or left, authoritarian governments should be deposed; but I don't think anyone even slightly informed on the conflicts of Latin America and the Caribbean from the last years of the 19th century up until today would doubt that the US doesn't care about the well-being of the people of these nations and only interferes, however it can, in their politics and self-determination to protect its own economic interests
And even though the USA did maintain dictatorships in the area, I think it's safe to say that in this scenario (probably not in areas of Africa and Asia), it was for the greater good. Of all the military dictatorships the USA upheld, from Brazil to Chile, they are now thriving democracies with high standards of living (although Brazil is getting so corrupt that some are demanding a return to dictatorship). If we look at the far-left bloc, like Cuba and their Venezuelan amigos, there is mass poverty, the greatest refugee crisis in this hemisphere, and millions of innocents murdered in Cuba alone - many times more than all the victims of the military dictatorship combined.