That's because you probably don't really understand any of those concepts. The spectrum isn't a straight line. You can be economically liberal and socially conservative, or economically conservative and socially liberal or you could be libertarian. You could be a crony capitalist. I imagine the variety of human thought to exist more like on a sphere than a straight line.
I get it, it just doesn't make any sense because you're imagining this as a straight line with an edge. From the perspective of the crony capitalist
he's not an extremist.
Well look at sports leagues and their revenue sharing. The popular and successful teams help to support the bad and mediocre teams because without them you don't have a league.
Solves problems for whom though? Unfettered capitalism allowed slaver plantation owners to live a life of leasure and luxury but did it solve or create problems for the slaves and their families? My point is that capitalism and communism are trying to solve different problems.
What does that even mean? Communism and capitalism are representations of different aspects of human nature. Individualism and community.