Exactly, I'm not doing anything with the money anyway. Why should I be able to live off of an investment that requires no labor? Doesn't that make the lender essentially a net consumer of society's wealth?
Your answer doesn't follow what I said, so I don't know why you said, "Exactly."
If you have $10,000 in savings, where did that come from? Your labor, probably. Possibly, the labor of your father, who did with his earnings what he wanted to do (give it to you). At any rate, you could have spent that money, but you instead chose to save it and consume later. Or invest it.
Credit is a useful thing. I wouldn't be living in a house without it. So I don't have any problem with lending or interest. The lender is taking a risk, whether it's the bank, a financial operation, or an individual, so they deserve some interest for their risk.
I think where you are probably breaking from that basic idea is where you see the very rich, with piles of money that, through time and sometimes sheer numbers, has become disconnected from productive work. Amazon is a fine company, but why does Jeff Bezos need to keep accumulating billions when he's not really doing much to earn it anymore?
To me, that's more a question of the labor market. Owners get rich largely because labor doesn't get paid anywhere close to their value to the company, and that's due to the weak labor market, not interest. The financial sector lives in that space as well, sponging off of the difference between the true cost of a product and what people actually pay for it.