151,600 people die every day. 774 676 000 people have died since 9/11. Stop making such a big deal out of 3000.
if someone stole 15,000 dollars worth of stuff from your house and i said to you "yeah well hundreds of millions of dollars are traded on the stock market every day", your response wouldn't be "yeah i guess you're right, it's no big deal".
death is relative by volume. 100,000 people dying of heart disease over a year is not equatable to 3,000 people dying in their offices over the span of hours.
hell my granpda's death is dust in the wind statistically but that stuff still matters to me, so just multiply that 3,000 times and you can see why it can still be a touchy subject