What makes it also easier, is that the damage is done, and time has passed.
Also, I am no fan of declaring these astronauts heroes because they died in a mission. All astronauts are either heroes or they are just hard working people - depends on how you call people who risk their life and health everyday for working at the frontiers of humanity. Dying is no heroic act and it was no deliberate sacrifice, that you can say has anything done for saving the lives of others. Sad is the nation, that needs such heroes. Even more, it makes it look like astronauts have to die as part of their duty. That is completely wrong, astronauts have to stay alive, or the mission is failed. They just take more personal risks and more personal responsibility as others - and if this responsibility is betrayed by NASA managers, they are not heroes, but rather victims.
And so, what is left? You see dramatic sequences of images of a preventable accident, that should be seen by every engineer for reminding how small errors can go wild. You don't see astronauts passing out, getting shaken by strong accelerations, injured by small debris flying around and getting crushed on impact on the surface of the ocean. That sure makes it easier. It is a as clean situation as the first nuclear bomb explosion, which also makes it easy to not look for the corpses.
If you watch it, be happy that it was not you that day. And if you one day have responsibility for the lives of others, remind yourself that what killed Challenger was not a leak in the SRB joint, but a chain of decisions, in which managers put their careers and political goals over the safety of astronauts. If it wouldn't have been Challenger, another mission would be hit. It was inevitable as long as the managers had not been responsible.
And it was maybe what Challenger also failed, because the mindset did not die with it. It happened again for Columbia. And maybe, it will happen again. I am not sure, that managers learned from their mistakes, without ever being responsible for their decisions.