To an extent I would agree - yes, some sort of caveat might be necessary where actual code snippets exist. Those answers where only links are included, probably not necessary. However, no matter how cheap the solution, it should not be entirely free - especially when it comes to security (if it's worth securing, it's worth spending some money on).
Now...that said, if I had a manager that made the decision to use code snippets off of any website without some serious consultation (either from a shrink or security expert), I would hire that shrink to have his head examined.
Now, to answer your question - if you supplied any code, I would put a disclaimer just to CYA. Is this overkill? Maybe. But did you hear about the man who decided to use his lawn mower as a hedge trimmer; cut his fingers off; sued the lawn mower manufacturer...and won? Obviously, no matter how ludicrous most of us think an idea is, someone out there is willing to try it.
All that said, @The Cat points out that SOFU has a disclaimer. Never hurts to add your own when something is as important as security is concerned.