JT... I agree with you sometimes, and disagree sometimes. Here is a little of both.
Your point is valid only if ANY stat could make you partially responsible. If you go 23/24 for 2 TD and 0 INT, but the one incompletion was a 5 yarder to a wide open receiver in the end zone as time ran out in a 24-20 game you were losing and then lost, which you short-armed..... well.... then you are more than partially responsible for the loss. Each game has to be taken separately, and the game inspected to see WHERE the stats occurred from the QB. Some incompletions hurt more than interceptions. A hail mary at the end of a half that gets picked looks like an interception on the last drive of a game in the 2 minute drill while down 4 in the box score, yet has much less impact than an incompletion on 3rd and 3 with 3 minutes left down 5.
I choose to look deeper into the stats than make one blanket statement that "Well, he threw an interception, so he is just as much to blame as his teammates". Sometimes that is true. Sometimes that is just flat out wrong.