I agree, and that's precisely the sort of software I've seen using the WTFPL license. I don't think it's right to characterize this as reckless. Licensing something like PostgreSQL as WTFPL would be reckless, but I don't think that's how the license is actually used by the community.
"Reckless" is too strong, but shortsighted or poor judgment might be more appropriate. If you're using a software license for anything, whether it's a hobby, a helpful library, or a potential business venture, that means you're distributing your work to the world.
What benefit do you gain by using a poorly understood license that is effectively the same as widely used permissive licenses?
To let other Joe Blows know that they should feel free to do what the fuck they want with your code.