>People messing with the sterilization or the self-checks for sterilization could easily result in bacterial food borne illness which can be deadly.

Yes, it's deadly, this is exactly the reason why we should make sure that McDonalds staff can properly operate their icecream machines by making the machine as easy to use as possible. If you have untrained staff that keep running the machine out of specs because the machine is cryptic and user hostile to them then operator errors could slip past the machine self checks because machines aren't perfectly reliable.

By instructing McDonalds franchises how to properly operate their machines and by updating the UI of the machines to properly warn of dangerous operating conditions the franchises can achieve greater safety for McDonalds customers.

As it is right now, McDonalds is actively endangering its customers with these machines.