No, but the MANAGEMENT of NASA -- especially the POLITICAL MANAGEMENT -- is by no means infallible or beyond criticism. They have made errors of judgment before, and it is thus quite legitimate to wonder out loud if some more haven't been made this time.
No one is infallible. Do you have any idea what you are asking human beings to be? - They will NEVER measure up. With people who think like you, that for every accident there are people to skewer for every risk ever taken, what, pray tell, would we ever accomplish?
For the guts they have to risk everything and take part great things, I admire them. And I thank them for the moments of great amazement they bring to us. And I stand by them now. It is easy to send them out on our missions if we only have to be loyal to them when they win. Loyalty only really has value when they lose.
With efforts as complex as this, you always walk shoulder-to-shoulder with disaster. Tough are the soles that tread the knife's edge.