The problem, Miles will be the first one to tell you, is that Barrayar's definition of treason is much too large. Unwieldy large. Unseemly large. Un-enforce-ably large.
And this wouldn't be a problem! For anyone else, that is. For Miles, or, really, for anyone who knows Gregor and wants to get that frozen smile off of his face and replace it with some, any, real emotion, this is a problem.
Because, it turns out, much too much on this planet counts as treason. And Simon Illyan has no sense of humor, and getting shot would be a bad idea.