So Darwyn, do you truly beleive that loans and interest are inherently evil? Or is it just interest you're against? Because without interest, there would likely be no loans (well there would probably still be small loans among friends/family, but basically no business loans, or likely housing loans or anything else like that). Why? Because without some kind of compensation for not having the use of your money (which is certainly an opportunity cost) why loan it out for x period of time?
How do you feel about the idea of interest bearing bank accounts? Because those wouldn't be possible without banks giving out interest bearing loans. Additionally, your bank account is effectively a loan to the bank, how do you feel about loaning money to banks? (Or do you not use banks?).
How do you feel about investment? Because by buying stock in a company, or investing in a friends business start-up, and expecting to share in the profits, doesn't that allow you the investor to "reap these benefits while doing nothing to earn them?" I honestly don't think there is anything (inherently) morally wrong with lending money at interest. It compensates you for not having the use of your money for the period of the loan, and allows you to help someone with a project, or business, or whatever, that they are clearly passionate about and that they want to make happen.
Look at it another way: Your friend wants to start a business, say, making pins (to use Adam Smiths example). He knows about the business and he thinks he's worked out a better way to make the pins than anyone else, and is sure he can make a very successful business with it. But he doesn't have the money to get started. You want to help your friend out, becuase you beleive he's right, and he's got a new and much better way to make pins. But you don't have any of the talent to help with making pins, and don't know anything about the pin making business. But what you do have is some money. So your best contribution is to loan your friend some money to start up his business. But you don't have a huge amount of money, and giving up that money for the year or so that it will take for your friend to get everything up and running, and to be able to pay you back is going to be a bit of a hardship, you've got other things you could do with that money, like investing it in your own business, or buying somewhat nicer things for your family, so you ask your friend to pay you back with a small bit of interest, so that when you get your money back you have a bit more than you loaned out, as compensation for the slight hardship you experienced by not having the money to use (or to gain interest on in a bank account). Or, you ask that the money you paid, give you a partial ownership in the business, so that whatever profits the company makes you share in. Is this really that unreasonable? You both gain some benefit from the arrangement. Your friend gets to start up his business, that will hopefully be successful, you get to help contribute to that success by providing capital, and you make some extra money as a result. Honestly I don't think this is evil or bad at all, I think it's entirely reasonable for someone to expect some sort of compensation or reward for helping someone else's success.
All of that being said, I won't try to argue that there is no way to abuse this system, that there aren't predatory loans, or that debt can't be used to effectively keep people in slavery (share-croppers in the post civil war south comes to mind, as do mining and other companies that kept their employees in debt to keep them there, and to be able to pay them very little). There certainly do need to be laws and regulations to make sure that people actually know and understand the terms of what they are signing up for, bankruptcy laws to let people get out of debt they can't possibly pay for, and laws about what kinds of interest rates can be charged. But I don't think that debt and interest are inherently evil, or inherently lead to "slavery." Lots of things can be used for evil purposes, but it doesn't make them inherently evil.
I've still got that other response half written (didn't get my computer back up last Friday until quitting time, and then... well it was the weekend and I had better things to do, than debate monetary policy. like go to my friends wedding. ;) ) I'll try to finish it today. I'm not sure without a lot more knowledge of the banking system, or economics in general I'm going to be able to satisfy your rage against interest being charged by the federal reserve, but I've got an idea I came up with Friday that might help explain why interest from government loans make sense.
Part of the reason no one has "answered straightly" may simply be because this is a complicated system, so there may not be a "simple" answer to your questions. (Also none of us are economists or bankers, so we're all kind of just trying to figure it out along with you, but just as you intuitively seem to feel that our current monetary system is bad, and therefore do research to try to find out why it is, many of us intuitively feel like it probably does work and is (mostly) good in the end, so we're working on doing research to show why it's (mostly) good.)
Anyway, hopefully I'll get some time today at work to finish up, and polish, that other response, (and ideally do some research to actually support my theory, or I'll find it's not true at all, and have to give up on that line of reasoning. I'll let you know either way.).