Venezuela "sucks right now" due to geopolitical egotism. We've turned them into a pariah on the global market, penalizing nations that dare trade with them with our own sanctions.
Of course the Bolivar tanked. You can use a dollar to buy anything in the world. You can't use the bolivar to buy diddly squat.
Refusal to trade? Since when did we have a broad trade embargo on Venezuela? We floated the idea of specifically an oil embargo only this year, with damn good reason given their human rights issues. You're reading too much Noah Chomsky.
Human rights issues? We trade freely and openly with Saudi Arabia. "Human rights issues" is trumpeted ad nauseum to cover for our self-serving international vendettas.
Like many former colonies, they suffer from a resource curse. Nationalizing their primary, non-renewable, extractive industry is the only way to ensure that their economy didn't centralize and stagnate, to ensure they didn't remain a vassal state[1]. Norway did it and they're a thriving, economically diversified, socialist state with an enormous sovereign wealth fund[2]. Libya did it to pursue the same societal goals and we exterminated their ruler and destroyed their state to such an extent that slavery reemerged[3].
So let me get this straight: you're shifting from arguing that the US bears responsibility for the Venezuelan crisis by a supposed embargo that did not exist to implying that were at fault because we don't impose enough embargoes? Look, the world is complicated and no one ever claimed the US was a shining beacon of morality. The issue is a distortion of the obvious and we'll understood proximate causes of misery in that otherwise oil rich country, which should be as prosperous as Norway.
All aid from the IMF comes with punitive strings attached. Enforced austerity from abroad. A painful, unwarranted contraction of the economy primarily felt by the people most at risk.
>There are sanctions on their government bonds
You sanction a government bond and guess what happens? Debt becomes expensive, development becomes impossible. You are unable to cushion economic shocks like the threat of sanctions by a major economic superpower. The threats become liable to throw the entire economy into chaos, sending investors, domestic and international, fleeing for less risk.
Of course the Bolivar tanked. You can use a dollar to buy anything in the world. You can't use the bolivar to buy diddly squat.