There is nothing wrong with either communism or socialism when done properly
But they have the same problems as capitalism , they are run by humans and humans are greedy mean deceitful & power hungry . so eventually Maoist China, became the China we see today which is about to overtake the USA as the biggest economy on the planet , Free health car including dental means that they will all live longer than Americans .
When they get old & infirmed they get looked after by the state , not tossed out onto the pavement the second the funding runs out .
Maoist China took hundreds of millions of peasant farmers who would have been farmers all their life with little to no education raising children who would also become peasant farmers who would have children & if any lived long enough, they would become peasant farmers . Out of poverty and gave them an education and a choice over their future .
Have a good look in the mirror
The USA has a declining birth rate because people can not afford to have children, A professional couple struggle to save enough money to acquire a place to live in.
The actual life expectancy of both men & women is falling despite the infant mortality being one of the lowest in the developing world .
Low income Americans have to go to third world countries or Cuba for medical or dental attention because they can not afford hospital treatment in the USA .
The living standards of the middle class & lower class are declining . the air & water are polluted .
parents drop their kids off at schools then offer a prayer that there will not be a deranged gunman break in & shoot them during the day
So this is progress
So this is good
So everything else is evil ?
I think the simplest way to put but an actual reason to it is that in the us, the problem is the people, well certain people and a number of the people. Lol
I'm serious. Enough bad decisions or going down and staying down the wrong path long enough can screw up anything.
Frankly, it's amazing the US has done as well as it has for as long as it has because of the apparent lack of an actual long-term plan, the power shift every 4 to 8 years among political parties that are almost polar opposites, the people who have multiple times throughout even recent decades been quite at each other's throats.
I guess in some of these cases the theory that volume hides a multitude of sin has worked out in its favor.
Then again, a lot of this is just smoke and mirrors and there's probably a lot to be said for the powers that be whether you want to call them Illuminati or whatever...who likely exist more than we know and do have long-term goals and manipulate everything towards their own benefit and end game regardless of how long it takes.
What has always kind of sad to me about US history is take any one of the several good time periods where they were doing it fairly correctly or on top of their game or let's say high ranking in the world if you were to take score.
When the rest of the world slipped with something they were okay with themselves slipping as long as they were maintaining their lead over everyone else!
This is a sad way to look at things!
You should always be trying to improve your own situation and yourself or at least maintain it!!
Pretty much every form of government, like the ones you mentioned, have their pros and cons and any could work quite well if it weren't for that natural fact that humans are flawed and screw up about everything - eventually.
I also feel it makes it far more difficult the more people you have and once you get above a certain number.