I don’t think bringing the ISS down in a controlled way is because of the risk that it might hit someone on earth, or because of “the PR disaster” of us “irrationally worrying more about the ISS hitting our home than we are getting in their car the next day”.
Space debris is a potentially material issue.
There are around 23,000 objects larger than 10 cm (4 inches) and about 100 million pieces of debris larger than 1 mm (0.04 inches). Tiny pieces of junk might not seem like a big issue, but that debris is moving at 15,000 mph (24,140 kph), 10 times faster than a bullet. (Source: PBS)
This matters because debris threatens satellites. Satellites are critical to GPS systems and international communication networks. They are used for things like helping you get a delivery, helping the emergency services get to their destination, or military operations.
Any one bit of space debris probably won’t cause a big deal if you ignore knock-on effects. However a phenomenon called Kessler Syndrome could make things much worse. This arises when space debris hits into satellites, causing more space debris, causing a vicious circle.
The geopolitics of space debris gets complicated.
The more space debris there is, the more legitimate it is to have weapons on a satellite (to keep your satellite safe from debris).
However such weapons could be dual-purpose, since attacking an enemy’s satellite could be of great tactical value in a conflict scenario.
I haven’t done a cost-effectiveness analysis to justify whether $1bn is a good use of that money, but I think it’s more valuable than this article seems to suggest.
Can you give an indication of how common the problem is? (ie how often do papers get lost/deleted?) My intuition says not very often, and when it does happen it’s most likely to be the least useful papers, but I could believe my intuition is wrong.