The writer of this article got it wrong, as "Nothing is true, everything is permitted" is meant to be a statement of fact to Assassins, not a code to live by. There is no objective truth and you can do anything you want.

People like to leave out that Andrew Ryan didn't follow libertarian philosophies. He made sure that he had all the resources and took Frank Fontaine's when Fontaine threatened to become more powerful and influential than him with ADAM.

Video game plots serve their purpose perfectly as video game plots.

Whoops, pressed enter accidentally. Anyway, "Nothing is true, everything is permitted" is seen more as a statement of fact than a tenet to live by. As in, there is no absolute truth and you can absolutely do anything you want.

I haven't seen the movie, but they likely communicated the actual message poorly. It's actual explanation is something of an Easter Egg buried in the second game, just because a small number of players would've dug enough to find it.