You are right in that in MK9 Scorpion did "mourn" for his family, but you have to remember too that he was also fighting for his lost honor since OG Sub "stole" his (and his clan's) honor when he killed him back in Mythologies. You make some good points over all, and you are entirely right about the samuria honor code...but that only applies to Scorpion as he was in life. At the moment of Scorpion's death he didn't fear the lose of his honor but he did fear the lost of his family. When he was resurrected though, he found that he, and his clan, HAD lost their honor regardless, and on top of that , he had lost his family as well. This is really of why I brought up EG Scorpion and Armageddon Scorpion in my other post. Scorpion's character had been through a little more development at that time in the story, vs just what was seen in MK9.
Bottom line is that Scorpion is kind of an honor bound character (even in death), and from the beginning he's been trying to recover his and his clan's lost honor to earn the right to be with his family again. After MK3/MK9, when Scorpion found out that Quan had been manipulating him from the beginning, Scorpion had become kind of mentally broken, and also became WAY more dangerous. And it happened again / even more so in MKA.