I always wonder about landing after an engine failure on takeoff/climb out. Do you land over-weight? Or do you stay in close proximity to the field and hold until you are below max landing weight. (off course this is if fuel dumping is not an option). If holding, would you put the gear down to increase rate of fuel burn?
Alf asked the question and I made the point using an extreme example of the Swiss Air disaster that you need to appreciate that there are some situations where structural landing weight limits are relatively trivial. In-cabin fire is one example. I would argue that being down to just one good engine is another.
Yes the chances of losing both engines on the same flight are extremely remote, but the fact that you already lost one engine does not make the loss of the remaining engine any less likely.
Just like when you walk up to a roulette wheel and you notice the last five rounds have been all reds. You figure the chances of the next number being a red is remote because the chances of having six reds in a row is 2x2x2x2x2x2= 1 in 64. But in fact the chances of the next number being red is still 1 in 2 (ignoring the green zero).
In fact getting back to the engines you could argue the chances of the remaining engine suffering an engine failure has just increased. After all they are of the same design and have things in common such as fuel supply and environmental conditions which may have contributed to the first engine failing.
Hope my point is clear now.