[Delk]

I'm not an expert, but I've got the impression the dying out of the samurai class was pretty much because they weren't really needed any more, and such a special class wasn't really in line with the modernization and westernization efforts that were being made in Japan at the time.

Of course any endeavour can meet an early end due to carelessness or because of not stopping and considering whether what you're doing is actually a good idea. But carelessness would probably not have been held in high regard by the samurai, and I generally fail to see a simple connection between to the samurai class becoming outdated and a preference for "quick" thinking.