What do we do with the economies once we controll them? We open the markets to our businesses and they raid the place. As our government is cpaitlaist all the decisions are based on making money. All those politicians that decide who to go to war with own stock in the companies that will profit. There is no difference between those drives.
Why did we not want rivals to gain power? Just vanity? No. The risk to future profits. When you look at wages and workers rights when the USSR fell the Capitalists had no competition. Wages were lowered everywhere as conditions would permit. After all, where else could people go,?
As to workers rights it is pretty simple. All that needs to be is that workers are given dignity. My boss can fire me and I might starve to death. If my survival wasn’t based on pleasing the most greedy people then I could make better decisions about how to use my time. So, just more money and safety. As communists we have a very specific idea we have about how to acomplish that.
Depending on what sate you live in you could very easily be fired for being queer. Because your ability to survive us based on money anything that riskes that is effectively not permitted by capitalism.