From my experience helping manage a block of 36 flats (as a resident director) no matter how many times you tell people about keeping hallways clear, and no matter how many letters you post or clearances you carry out, many people don't or won't take fire safety seriously. Tackling serial offenders can be expensive, time consuming and often futile, which is very frustrating.
The 'good' news about this awful event is that something has clearly gone very wrong with the cladding. This is going to be horrible.
Edit: I see the complaints in question included concerns about the cladding. I heard someone on the TV talking about clutter in hallways though, which is what prompted me to type based on personal experience.