A better assembly manual isn't going to help those that are willing to take short cuts. I think in many cases they KNOW what should be done, but thats too hard to do.
After all it's just easier to weld two bolts together, than it is to get in the car and drive ALL the way to the hardware store, AGAIN. I mean I JUST came back from there, screw it,,, glue it, weld it. Yeah, thats the ticket!