I was not able to get that article from the WSJ here, so if anyone has a electronic copy I would very much appreciate the chance to read it? Thanks.
Those comments by Mr. Buffet are a few years old. He bought an insurance company through his Berkshire Hathaway Group and there were some significant off-balance sheet liabililties stemming from derivative trades. Such was his fury about all derivatives.
In many cases, derivatives are less risky than trading the underlying. For example, I buy DEC WTI at $60.00 which is 1000 barrels or a value of $60.000. As I trade on margin, I only have to put up $4800 in collateral and I can trade. Lately we have seen moves of 3.5-5.0% per day. Let us say a 5% move on 60.000 is $3000. You put up $4800 in margin and after one day you may have to post another $3000 which brings your investment/risk to $7800. Now you have to decide to close the position or keep it open. Everyday you leave it open you risk having to pay another $3000. Remember at every price there is a 50/50 chance the price will go up or down. This is very risky.
Now let's say instead you decide to buy an option because you think DEC WTI may go higher. You may pay $4800 for that option on 1000 barrels which will expire on NOV.20 for the DEC contract. Over the next month, the most you can lose is your original $4800 in premium. If the price goes first lower and then higher you're fine. If it goes higher you're fine. You only lose your premium if the price goes lower and the option expires worthless. Then you have lost your $4800, but you would have lost that and more if you had been long the underlying DEC WTI contract. In this case, options which are a derivative are far safer than buying the actual security or contract.
However, the derivatives Mr. Buffet is talking about are not plain-vanilla puts & calls. He is talking about the so-called exotic options that incorporate such weird & wonderful features such as knock-ins, knock-outs, contingent liabilities and make great use of leverage. These products should only be traded by rocket scientists and Noble laureates in maths & physics. They are effective risk reduction strategies when used properly, but when abused their characteristics make them very dangerous.
For example, an insurance company tries to match its assets & liabilities, but are restricted from investing in certain products. In a low inflation, stable investment environment, it is very hard for them to earn a premium so that they can payback any claims in the future. Let's say they need 3% real-growth per year to pay-out claims and 30-year treasuries are yielding 4.5% which is just 2.5% after inflation. This makes their future liabilities much greater than their income stream. They may not mandated to invest in riskier assets like low grade corporate bonds or equity markets.
What do they do? They employ structured products, which incorporate certain assumptions. Basically, they buy options that allow them to profit more than the going market rate if they are right, but in return for earning a higher yield today, they have to take the risk that they will be called upon to accept less favorable yields in the future if their view is wrong. Now, if they are right, happy days. They collect the premium, they invest at a higher rate, the contract matures, they pay the claim and make a profit for their shareholders. However, if they are wrong, they end up earning a much lower rate, having to pay the claim out of their shareholder's equity and everyone says it is because they invested in derivatives.
One man's lifeline is another man's noose. These specific risks inherent in any structured product have to be carefully understood by the buyer, by the risk manager, the credit officer, etc. However, all too often, when people are making money they do not look at what risks they are taking to make money. Then when they lose money, they blame the product which they didn't understand. Well, I could go on, but you get the idea.
By the way, you do not have to invest in each of these products individually or separately. You can invest in proxies to capture some of the underlying benefit to offset risks elsewhere. People often complain to me that banks only pay them a misery rate of interest, while they are announcing record breaking profits. I say, why didn't you invest in the bank's stocks instead of putting money into deposits? Then you would benefit from stock appreciation and dividends. Well, you can lose money investing in bank stocks, too, but the point is to look at your underlying risk and find a suitable investment vehicle for you to offset that risk.

The organized state is a wonderful invention whereby everyone can live at someone else's expense.