The bridge was installed to increase student safety at Florida International University in Miami. Some died. Some were injured. Some are trapped under the bridge. Cause is TBD.
Cutting corners is always dangerous.
While construction companies claim that "instant bridges" (building them on the side then installing them fully built) are for the public's benefit (they're not holding up traffic and such) it's more than likely a way for them to save money (quicker to build). Many customers (especially state and federal government entities) offer contractors large $$ incentives if they finish a project ahead of schedule (the earlier they finish, the more $$$ they make). Therefore, many contractors do the best they can to get their project done quickly so that they collect these incentives (working on a project 24/7, approved worker overtime, and such). Rushed work can mean corners are cut (with or without the contractor’s knowledge). In the past, a few contractors have even used substandard materials in their projects or simply left out a few “minor” pieces, just so they could make a greater profit (less money spent on materials equals more profit). Sometimes these unscrupulous methods pay off (no one notices for years); other times they have costly or even deadly consequences.
Of course, it’s not always the contractors fault. Sometimes it’s the design that fails (i.e. the Tacoma Narrows Bridge in 1940). Sometimes the materials fail (nothing is made “perfectly”). Sometimes nature plays a part (earthquake, animals/insects, weather, water and such).
While we may want to say that rushed work or faulty materials were the fault of the bridges collapse, until a detailed analysis is preformed on the bridge, any “conclusions” we might make are simply conjecture. Just because a structure like this worked fine elsewhere doesn’t necessarily mean it would work where they installed it. However, whenever a tragedy occurs we want to blame it on someone - right now (someone’s gotta pay)! Yet no amount of knowledge (how/why it happened) or compensation (lawsuits) will ever bring back one life that was lost.