... wow. You, sir, are wrong on the Internet.
I would guess you're lying about ever having taken Econ 101. I'm either an idiot or an expert, having taken it three times, but I do remember quite clearly about day four of the first time round, when the Economics teacher, arms flailing wildly, yelled as loudly as he could "ECONOMICS IS NOT A ZERO SUM GAME!" He then went on to explain that anyone who said so is an idiot who doesn't understand economics. The textbook went on in more or less the same fashion.
Your post has approximately as many mistakes as it has sentences. Let's begin, shall we?
"There is a finite amount of money."
No, money has value only because we imagine it does, and has no intrinsic worth except as a means of trading value. The amount of value in an economy contracts and expands, and is roughly the sum of everything useful that everyone does plus the value of everything everyone owns. If you work harder, the economy gets bigger. If you slack off, the economy contracts by just so much. If you create something new and useful, you have created wealth. If you destroy or quit doing something useful, you have destroyed wealth.
"Thus, if $1000 more is spent on software, $1000 less is spent elsewhere. Roughly speaking, 6000 new software jobs equals 6000 fewer other jobs."
No. Value is measured by how much work people are doing and what they are creating. If the money supply stays constant but the amount of work being done increases, then money *becomes worth more*, because there are more things for it to buy, but the same amount of money to buy them with. This causes downward pressure on prices, and is called deflation. To counter deflation, the government prints new money. Actually, the government generally prints a little too much money, creating inflation, a phenomenon they have nigh-complete control over. Governments like inflation because it lowers their effective interest rate, making it easier to pay it back later.
"This is approximately a zero sum game."
No. It is not even approximately a zero sum game. Adequate optimization of economic systems is a major reason that the United States has done such a good job of getting absurdly wealthy, despite having a smaller population base and comparable natural resources to other major powers. This is a game of multipliers and exponential growth effects; there is very little addition involved, and the sum is certainly not zero.
"There are benefits to reducing piracy, but their argument doesn't hold water."
Oh, I apologize. One of your sentences is correct, so actually you're at 25%. Dreadfully sorry about that.