Just like literally every other system ever devised or imagined. Ideas never work perfectly when people are involved, best never make the effort right?
No? No one has, except for some very isolated cases on the small scale. One of the downsides of a system which has never been tried at the large scale.
I have seen the effects of capitalism though: the concentration of resources in the hands of a few, homelessness, environmental destruction, neo-colonialism and third world exploitation.
Additionally, I have seen the effects of state capitalism pretending to be socialism, and even that brief period of apparent socialism elevated the impoverished, fed the hungry, housed the homeless, and literally rocketed a nation of peasant farmers to a world superpower in like 50 years. As everyone knows, that period soon gave way to to the corrupting influences of capitalism. Toward the end of the the USSR, and shortly after its collapse, the forces of capitalism again ravaged the region, and looted communal resources for personal enrichment.
I think your heart is in the right place, but I'm just curious... If the Soviet Union was "pretending to be socialism", what is or was actual socialism?
You're making things up. The hungry were hidden, the disabled were shamed, the homeless were turned to thieves, no reason was needed to send anyone to siberia. And sent they were. russia has not been just a nation of peasant farmers for a very long time.