The paradox of making money from opponents mistakes

[Xhad]

The simplest way to put it:

You make and lose money due to mathematical mistakes. Mathematical mistakes are actions that are incorrect according to your EV if you knew your opponents' cards.

A strategic mistake is an action that is likely to produce a mathematical mistake.

Betting the AK in your scenario is not a strategic mistake because you are a favorite against the blind's range of hands, but it is a mathematical mistake.