What if it IS what my character would do?

[Rater202]

It is always a player's fault.

so the GM is completly blameless.

If the GM changes the rules without telling anyone and then gets made at the players for doing the stuff that wasn't wrong until literally this one time when they had no warning, it's the player's fault, not the GM?

The GM bares no responsibility for making an adventure that they know will be disrupted if one payer has his character act the way the character has been acting the entire game with no problems until now?

No, I reject that. In the case I gave, the blame rests entirely on the GM for changing the rules of engagement and deliberately creating an adventure that would be disrupted by the way he knows the PCs are going to act without giving them any warning or reason to suspect that things are different this time.