You’ve pointed out multiple cases where socialist experiments have failed, and none that have succeeded.

Each example I illustrated was a success. They were just conquered. Having a worse military is not a failure of a system, it’s a result of capitalist interests having the backing of the state, and said states having trained military forces, while workers are untrained in how to use violence to achieve the means they want, so they’re generally less effective at it. Being effective at using violence is not the mark of a good system, usually the opposite actually.