Too many people forget how much technical precision it takes to pull of a space mission and how much risk is involved. There's no such thing as a "routine" shuttle launch, and each mission shows the dedication and expertise of everyone in the space program, both on the ground and above.
Now is the time to mourn those lost, and appreciate their sacrifice. Let's not forget how much work it takes to get the job done, and how much work it will take to keep going.