Which is what you would want GM to do. Keep him only as long as it works for team.
Gee, and why wouldn't a player/family man want that hanging over his head if he doesn't need to?
Pietrangelo wanted that, and he wanted it here. Armstrong wanted Pietrangelo here, but he didn't want that.
Pietrangelo leaving doesn't mean Pietrangelo didn't want to be here. It just means he valued that security more than he wanted to be here. Tough to blame him. That clause is
huge for a professional athlete/family man.
Pietrangelo leaving also doesn't mean that Armstrong wanted Pietrangelo to leave, but he obviously valued having more control for himself over having Pietrangelo. That sort of power is huge for him, too.
It cuts both ways, not just one.
I personally think the Blues needed Pietrangelo more than Pietrangelo needed the Blues, so this hurts the Blues a lot more. The Blues lost an elite #1 D, and perhaps their ability to contend for the Cup in the near future. All Pietrangelo really lost was a couple of million dollars, the ability to continue living in St. Louis, and perhaps some nebulous things like a jersey/# retirement, a statue, and whatever else that I'm sure he cares very little about right now.