You want KFC for dinner.
Down the street are 2 different KFCs.
One uses oil that sometimes, a very small percentage of the time, will instantly kill you. The other does not. They arrived at using the riskier oil because it saves them 5c a day and it makes the books look better.
Are you really asking why anyone would even bother differentiating these two because the drive to the KFC carries more risk?
Why would you as a consumer want to fly on something with an ever worsening safety record?
Why would you as an airline want the bad press, loss of revenue, and loss of reputation associated with a safety incident?