Socialism isn't the opposite of capitalism; it is a complement that addresses specific market failures and can improve its ultimate performance.
For actual examples of not-capitalism, I recommend looking at the coordination work that won this year's Economics Nobel Prize for examples of more-efficient solutions to specific distribution questions. Even corporations themselves are a compromise of free market principles: pure capitalism has no absolution of individual responsibility. It is entirely reasonable to question what trade offs we prefer in choosing mechanisms to distribute scarce goods and services.
While I agree it's reasonable to question, I'd prefer that I allocate my resources how I deem appropriate rather than the government do it for me. They aren't nearly as efficient.
For actual examples of not-capitalism, I recommend looking at the coordination work that won this year's Economics Nobel Prize for examples of more-efficient solutions to specific distribution questions. Even corporations themselves are a compromise of free market principles: pure capitalism has no absolution of individual responsibility. It is entirely reasonable to question what trade offs we prefer in choosing mechanisms to distribute scarce goods and services.