So rouge one got me thinking about the destruction of Alderaan, but not necessarily about the people that died, more about the people that didn’t.
Leia Organa, obviously, was not the last survivor of Alderaan. Alderaan was a wealthy hub of a planet, and it’s citizens were probably everywhere.
There were wealthy Alderaani college kids in their first semester abroad on a distant planet, and they learned they would never go home to their families again.
There were poor, Alderaani smugglers and space ship workers who might have seen their planet explode from miles away, and felt a portion of their heart go with it even if they were running from it.
There were Alderaani recruits at the imperial Academy and in the military itself, who had to hold back tears as their commanding officers told them it was necessary, and they would have gladly done it themselves to rid the galaxy of the Organas’ plague.
Some of these people defect, and some of them force themselves onward, trying to force themselves to believe that their home planet deserved this.
There were families off planet on vacation or visiting family, that are now refugees on that new planet, trying to build lives for themselves and trying to prove they weren’t infected by the Organas’ propaganda. (Or join with the Organas’ rebellion, depending)
There were patches of Alderaani diaspora on other planets, who lost their home planet and try to group together more fiercely and preserve their culture in the face of so many imperial loyalists around them screaming death to Alderaan.