A blueprint is only as good as the person following the instructions, but even the most experienced builder can have an off day, and when nothing seems to be going right workers will often pack it in before the project is complete.
But when those workers had one simple task to complete and couldn't even get that right they should probably start seeking employment in another field.
Sometimes bad work comes off like a cry for help, because when the work you do seems to indicate you've been drinking heavily on the job site there's nowhere left for you to go but straight to an AA meeting!
See 11 Ridiculous Design Fails That Defeat The Whole Purpose here