You fail to mention or give credit for all the games the pen started out behind and kept the team in the game for a win or to take the starter off the hook for the loss.
Starter lets up 5 runs in 5 IP. Team comes back and takes the lead. Pen let's up 2 runs in 4 IP and gets a BS and all the blame for the loss.
Where's the justice?
Now, that didn't happen in every game, and certainly the pen blew way too many games, but do you really blame the pen fully, when they often let up way less runs per IP in games with the Blown saves?
Earlier this season, I did a breakdown of every game, and who pitched better or worse in our wins and losses. It looked very clear that the pen was more responsible for more wins than the starters, and the starters were more responsible for more losses than the pen.
Look for yourself.
Yes, the pen sucked, but the starters sucked more and are more responsible for the turn around than the pen. Easily.