Because according to some, trading Callahan signals "rebuild".
It's possible to trade veterans at the end of their tenure with the team, for young assets, and still be a competitive team. There is enough veteran leadership on this team, trading Callahan for a young player (younger than St. Louis especially) won't effect "Lundqvist's window" the way some would have you believe. Didn't Henrik sign a long-term deal? His window isn't closing any time soon.
What does St. Louis do for this club? In the short term does it make us better than Pittsburgh, Boston, Anaheim, Chicago, San Jose, LA, even Tampa Bay? The answer is no. In the long term what does it do for us other than waste a perfectly good trade chip on an aging player for some dillusional shot in the dark run at a Cup we are not winning this or next season.
Lack of foresight.
Stewart + Schmaltz + pick would be better for this club going forward.
This is classic Sather, "i recognize that name, lets trade for him!".