Well, it's not. But repairs cost money, and any money spent on those repairs is money that won't go to the billionaire ruling class. Obviously that's no good.
This picture is old. It's been fixed for a few years. And this support was under an unused section of the bridge. The whole bridge was 3 train lines wide at first. And for freight traffic. But it had been repurposed into local passenger rail utilizing only 2 lines. Those lines not going over this section of the bridge. Was essentially so over engineered for it's current use that some supports being neglected wasn't urgent.
The bigger hurdle was wrapping up design and approval to build a whole new station at this spot and fix the bridge as part of that project scope.
The first bridge collapse I remember was Interstate 95 in CT back in 1983 (Mianus River). Ten years or so after that a bridge on the New York State Thruway collapsed. We clearly haven’t learned much in the past 40 years, so don’t hold your breath…
Shit's been like that since at least 2004 in Chicago, and my bet is that everyone with the power to do anything simply can't see the decline because it's so slow. It was like this 20 years ago, it's been fine for 20 years, so it's gonna be fine for another 20, right? Then let some other poor sucker of mayor raise taxes to try and pay for shit.