I think you're confusing laziness, ADD, and a general lack of discipline with stupidity.
Sure, at some point it's nice to derive something from first principles to really understand it at a deeper level, but often times that's a complex process and it's aided by learning the thing by repetition prior to learning by how the thing was derived. That's how we learn math after all.
I agree, at least when it comes to problems that don't fall into your core specialization. When you have a broken pipe, you don't spend several years studying plumbing, you just call a plumber. Similarly, when I have problem with LibreOffice, I don't start reading its source code, I go to Stack Overflow.