Your complaints about capitalism can mostly be handled without giving up all the benefits. Poverty exists everywhere, especially under communism, but right now a good deal of the source is competition from immigrants and outsourcing, both of which can simply be restricted. The fact that corporate profits skyrocket isn't something for most people to directly care about (jealousy is a nasty emotion) but FWIW this goes away if anti-monopoly laws are enforced and if corporations are prohibited from becoming huge.

Before you blame climate change on capitalism, please note the coal mines in North Korea and in China.

Nothing could be more equitable than people keeping whatever share of the pie they have earned.

I also truly do not give a fuck about start up founders... but if they aren't well-rewarded then they won't bother. What replaces them? Do you think that instead the government would operate all businesses? Without the possibility of bankruptcy, bad businesses (operating as government agencies) will continue sucking up subsidies. New ones will not be created unless the dictator is convinced that they would be useful to him.

The corruption problem we now have with politicians is indeed bad, but clearly this hasn't become universal throughout our culture. In a communist society, one might pay the store clerk a bit of extra cash to have him hide a bit of meat in order to save it for you. It all becomes totally habitual with all of the ordinary people you interact with every day. It's not just a matter of politicians.

I agree that the situation in the Scandanavian countries is unsustainable. Freeloaders are an increasing problem. The workload (taxes) have reduced the birthrate, and the low birthrate means that fewer workers will be sharing the load of supporting the old, each problem leading to the other problem and thus these countries are in a death spiral.