No, Steve Jobs' death was only the second worst launch day ever.
The last tech startup I was involved in (I'm really dating myself here ... ) me and the CEO went to make our first pitch on September 12th, 2001.
I still have a box of business cards kicking around describing me as "CTO, zHosting Ltd". They'd make great roach papers if I could smoke (asthma: nature's way of reminding you to "just say no").
(We buried the company at a crossroads with a mouthful of garlic two weeks later. If we'd just been a month faster things could have been very different ...)
My favourite is the novelist Chris Cleave had his first book "Incendiary" (about a terrorist bomb attack on London) released on the same day as the 7/7 London bombings.
The publisher pulled all advertising and all copies were hidden at the back of book shops as a mark of respect / so as not to be seen to be trying to profit from such an event / out of general decency.
Donnie Darko opened the month after 9/11, and many theaters refused to show it due to its depiction of a plane crashing. Didn't go positive in the box office likely as a result.
Absolutely excellent cult film for anyone interested.