Actually, many immigrants - including, I’m sure, some illegals - do excellent work. In our neighborhood we’ve seen Hispanics completely restore and remodel decrepit houses, engineer ingenious solutions to wet basements, etc.
I’m not condoning illegal immigration, but they are like everyone else - some do excellent work, some are lazy and lack imagination.
This is not an issue with the people that did the labor on the foundations. Either the metal used to attach the tower to the foundation was inferior or the way it was tied to the foundation was not to the design of the engineering.
I’m just pointing the finger at those who are the criminals coming in. Some have no ethics, let alone work ethics.