Worker co-ops are socialist, because the workers literally own the means of production. In fact, I argue they're about as pure as you can get with socialism, since there's no government getting in the way so it could theoretically exist in a stateless society.

Being compatible with capitalism does not preclude something from being socialist.

The Atlantic slave trade

About 2M.

human trafficking of today

Socialist countries are near the top of the charts here, like N. Korea and Cambodia. The problem isn't due to any economic system, but the failure of law enforcement.

resource wars... violence from police states to uphold capitalism...

Not sure what you mean by this, specifically, and I'd prefer to not wade too far into vagaries.

embargo and economic punishment of those who don’t submit to capitalism

If you look at the actual reasons here, it's usually due to human rights violations, authoritarianism, or something along those lines (affiliation w/ the USSR, the US's main enemy, used to be sufficient). Russia has recently received massive economic punishment and they are absolutely capitalist, and they got those sanctions due to the aforementioned reasons.

imperialistic wars

You'll need to be a bit more specific to arrive at a number, but generally speaking, the death toll wasn't that high, and all combined is likely way less than the Great Chinese Famine, which was entirely man-made.

drug overdoses

What's interesting is that most of those deaths are from fentanyl, and China is the main manufacturer of the ingredients to make fentanyl. So production starts in China, gets distributed abroad, and then ends up in the US, probably because it's relatively easy to get drugs into the US due to the cartels' established networks.

This isn't a failure of capitalism, unless you're blaming Americans for having enough money to buy drugs. Fentanyl production in the US is practically non-existent, so it's not like it's a failure of policy either.

Here's the source I used for this.

those dying of homelessness/lack of healthcare/food.

China and the US have about the same homelessness rate, and the US has a lower rate than many other developed countries, like France and Germany (and quite notably New Zealand). That said, reporting varies by country, so these figures probably can't be fully trusted.

These are generally more symptoms of the state of the economy and has little to do with the actual economic system in place, and most of the top countries here are quite poor generally and most of the countries with the least homelessness are generally wealthy, and their are outliers everywhere.

if we track the metric used that anyone who died under socialism died from socialism as you do

But I don't, those figures are deaths directly attributable to socialism, such as famines caused by poor central planning. Deaths due to natural causes and things not directly related to the regime in charge aren't included.

It's important to take the broader context into account. This happened at the start of the Cold War, so anything that looked remotely connected to the USSR was suspect. Árbenz legalized a communist party, and that seems to be what pushed Eisenhower over the edge.

It had nothing to do with the actual ideology of the Guatamalan government, but suspected ties to USSR. At the time, "communism" meant "USSR," and anyone that was sympathetic to communism in any form was suspected of being in league with the USSR.

If the Guatamalan Revolution happened just 10 years or so later, the US probably would've been an ally instead of an enemy of someone like Árbenz.