They went fast to beat Airbus, cheap as the total cost of the package (plane + training + etc ...) and therefore quality takes a hit.
It happens everywhere but I think we were all under the assumption that surely this industry wouldn't stoop as low.
I've been told a while ago that the engineering of planes involved a fair amount of "duct-tape" (used loosely here) to make all of it work despite the risk involved. I didn't think much of it.
Now I sure have a different take on those words. While growing up plane crashes that happened were rare or their own kind of event(9/11, german pilot suicide, MH370). Therefore people around my age (30) might have bigger faith in planes than one should expect from travelling in hundred of tons of metal, composite materials and fuel going 500+ MPH in the sky.