You are anthropomorphizing "Capitalism," as a sort of aggregate of all capitalist behavior, but with a single goal. That's not accurate. Individuals certainly try to accumulate wealth, but the best way to make a lot of money is to find a better or cheaper way to do something--a side effect of which is the impoverishment of somebody else. Just look at, e.g., the way Sun nearly killed IBM in the late 80's and early 90's. Sun never made as much as IBM did, but the people who founded Sun made more than they otherwise would have.

That, I think, is why you see internal contradictions. You're pointing out that the best capitalists do stuff that harms the average capitalist; if Myspace is making money, there's always a Zuckerberg waiting to ruin things. But of course, there is no "Capitalism" that encompasses all of the goals of Myspace's owners and Facebook's.

That also takes care of the apparent contradiction of outsourcing. The capitalists who lose to outsourcing don't like it; the outsourcers do. There's less money made (since the outsourcers charge less), but the economy is more efficient. That's capitalism--the net result of lots of self-interested people, who often act against one another's interests. It's not the vision of capitalism in which the rich, as a group, make consensus decisions to advance their collective interests.

Thus, that version of capitalism is wrong.

Oh, and slavery and colonialism are much, much older than capitalism as we understand it today. In fact, one can make the case that slaves are the oldest form of property. Certainly, I've never heard of a civilization that advanced at all and never had slaves.