What else can matter to us, other than how our lives feel from the inside?

Instead of trying to prove your opponent wrong, try to see in what sense he might be right.

Through the evolutionary process, those who are able to engage in social cooperation of various sorts do better in survival and reproduction.

I think philosophers can do things akin to theoretical scientists, in that, having read about empirical data, they too can think of what hypotheses and theories might account for that data. So there's a continuity between philosophy and science in that way.

Marxian exploitation is the exploitation of people's lack of understanding of economics.

One way to determine if a view is inadequate is to check its consequences in particular cases, sometimes extreme ones, but if someone always decided what the result should be in any case by applying the given view itself, this would preclude discovering it did not correctly fit the case. Readers who hold they would plug in to the machine should notice whether their first impulse was not to do so, followed later by the thought that since only experiences could matter, the machine would be all right after all.

The socialist society would have to forbid capitalist acts between consenting adults.