Given that bridge was in its 5th decade, I don't see how that applies to what the Italians have done in the last couple of decades, unless you're arguing what they are building today will be tomorrows Morandi Bridges?
i have no idea what the italians have been doing. i would observe that in the uk most bridge failures were in the 19th century, when the properties of materials such as cast iron were not too well understood - same lack of understanding that the morandi bridge seems to have had much more recently.
Wikipedia lists 282 bridge failures between 2000 and present, 4 of which occurred in the UK, 7 in Italy, and 35 in the US.
no doubt my wikipedia skills are lacking, but kindly where are you getting the 4 in the uk from?