First thought is for the welfare of everyone there. This is a tragic situation, and should never happen. Not that there is a 'good time' for this, but the holidays makes it much worse for the families, I'm sure.
But the analyst in me looks a bit deeper...
A quick check of the texas3006.com website shows that
this location is posted, so the one thing that the assailant might have known was that there were ZERO legal concealed carry holders around to stop him.
Could a CHL holder have stopped him? Maybe so, maybe not...but the probability that a CHL holder could have stopped him increases dramatically if one had been allowed to carry in that hospital.
Why don't people learn that when you create gun free zones, nothing good can come from it?!?