Maxperson
Morkus from Orkus
Speaking as a DM, I am pro-personal responsibility. Meaning the DM can handle it as I have already stated and, if one is the sort to really give a flumph about "metagaming," probably should. Failing to do so and them blaming the players for "metagaming" is a lack of personal accountability in my view.
You realize that that same logic means you are responsible when players cheat with their dice, since you brought them together for the game. It also means you are responsible if one of them punches another one in the face.
I think you should probably reconsider your definition of "personal responsibility", or at the very least realize that your definition only applies to you.