[jaapv]

I can understand this. Dropping the camera, water damage, being caught in a fire, how can any manufacturer give warrantee for that? Leica explicitely states that the camera is not weather protected.Those events are covered by insurance for that reason. And yes - an insurance company may well demand that you took reasonable care. I think, from your posts, that you will be well able to show that.
I really feel for you, it must be frustrating to the extreme, but honestly, lawyers won't be any help, unless Leica would want to avoid the costs and bad publicity from a lawsuit and settle (I hope for you that may be the case!)
Otherwise I would take Transcontinenta's offer if I were you and take all I could from my insurance.

Btw, I would recommend the use of a Lowe Omnitraveller camera case. In the circumstances you describe, it can fit it exactly into a Pelican case. Some Silicagel and it will keep out the moisture. Unfortunately keeping a camera in an extremely wet environment inside a damp bag for a longer period of time is exactly the worst-case scenario for moisture damage to the inside of the camera. It will give water the chance to insinuate itself into every nook and cranny. It is much worse than a short drenching.