Oh no, here we go again!
Maybe there should be some sort of "sticky" FAQ on "flight with one engine less than normal" at the top of R&N, which people could review before posting on threads like this.
In the current absence of such a document, how about a few facts:
* Aircraft like the A380 are designed and certified to fly for an unlimited period, one engine inoperative (OEI).
* Following an engine failure, a diagnosis and exhaustive review of the options available will take place. This will normally include input from pilots, engineering, the aircraft & engine manufacturers and management.
* If the captain makes a decision to continue, possibly to destination, the effects of a further failure will have been explored and prepared for.
* Because of its size and weight, airfields that are suitable for an A380 to operate in and out of are rather thin on the ground. There are plenty that could be used in a time-critical scenario (smoke/fire, etc.) but you'd likely be stuck on the runway and/or unable to park, taxi or anything else.
* Despite arguments to the contrary, convenience and cost do come into consideration. The passengers have paid to go from A to B, not by way of a day or two in F. If you can achieve this without a significant increase in risk, which is what the aircraft is designed to do, then it is a proper option.
* The professionals who operate these types of aeroplane are fully aware of the nuances of flight continuation and regularly practice losing one or more power plants and the decision making process involved afterwards. They also wish to survive the experience.