Doesn't change the fact it had zero-minuscule impact on you and the rest of your life and it happened 12 years ago. Would you like bad things that happened to you to be brought up every year of your life?
Its not about purposely rehaunting be memories of this to people on purpose, its about showing your respect for the national event itself.
If i had a family member in it (or even if a family member died in genral) i'd have to go every day of my life knowing that they died.
But there are people who will buy a flower for every grave in a graveyard and give them out and show some respect for them all.
Just as remembering this day is remembering the event and give hope to those who had someone die.
That is the only thing that gives me hope for this country.