Is it any surprise in an era where prevailing morality is, "It's only wrong if you get caught?" that you'd have (1) morons bragging how much they love to steal, and (2) reporters giving these idiots a forum?
It is one thing to "work the system". Maximizing your benefits within the confines of a system defined by others is completely acceptable.
Outright theft is another thing entirely. It doesn't matter if the seat is sitting there empty. It means slightly better service to the folks who earned/purchased those FC seats!
Like Boomer, I fly CO, which almost always has full FC. I'd imagine this stunt would be harder to execute there.
Ditto for UA - the rest of the employees sitting there wouldn't recognize the thief.
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"I will not be pushed, filed, stamped, indexed, briefed, debriefed or numbered. My life is my own."