The whole spectrum of the game theory involving miners goes deeper. Miners can be bribed to act in a way that would seem irrational at first, without knowing that there is a bribe going on.

Case in point: An attacker (let's call this Government A) bribes miners into mining at a loss, the chain of a fork, in order to push this fork as "the real Bitcoin on all major exchanges, which are also bribed by Government A, such as Coinbase et al. These miners seem to be mining a less valuable coin, but they are making more money doing so by accepting the bribes.

This is an attack on bitcoin, and this will explain when you see any miners mining segwit2x at a loss in the following weeks.