Perhaps it's Minnesota paranoia about no one wanting to be here, but Murphy never looked to thrilled when he was up with the Twins.
I probably read too much into it, but to me he seemed to gave off a "I was a Yankee and now I have to be a Twin?" vibe.
It's paranoia. Pierzynski did the same thing with the Giants and he was playing in one of the best markets in baseball. There were complaints about him watching Twins games after the trade.
It's natural. You come up with an org, you learn its ways, you become part of the system. When you leave - especially as a person in their mid-20s after spending your entire professional life with one organization - it's going to sting a bit. Maybe you reject them entirely, maybe you only wish you were back at your "home".