It's a bit long to translate while typing on a phone, but the main takeaway is that it was build in the sixties with then-novel and not fully understood material engineering practices which then forced frequent and expensive extraordinary repairs, to the point that it would soon have been economical to just demolish and rebuild it.
As for people asking why the highway needs to go through Genova instead of around, it's probably the same kind of reasoning that leads to using nuclear bombs to build harbors and the like.
It's more that people in Italy like to live and die close to where they were born. Genoa also was a very busy port until relatively recently, which is a natural population magnet.
Translation not very clear, but seems to say towards the end that the bridge will quickly cost more than it's worth to maintain (issues with the concrete?) and will need to be demolished.
I'm guessing what happened here is neither maintenance nor (planned) demolition.
