DOSH shutting them down implies that Disney was so negligent with their safety procedures that the state had to step in.
Disney voluntarily shutting them down shows that Disney is committed to making them safe, going even above what the law and state had recommended.
Lets put it this way: If Space Mountain failed its daily inspection and Disney kept the attraction closed, without the DOSH report having come out the day before, would this be newsworthy? Probably not. Disney closes attractions every day due to safety issues which are then corrected so the attraction can reopen. The only difference between yesterday and many other days before it - is that the DOSH report coincidentally came out the day before.