User blog comment:TheHachi/Rogue Spartan/@comment-663564-20110217163638/@comment-663564-20110218081331

This is also the reason I never liked Halo Legends.

Take a gander at this. In this post I attempted to detail the mental conditioning that Spartans went through. In short: It is highly improbable, if not impossible for some, to even conceive of the notion of betraying the UNSC.