Speed and the Paris Air Show.
I believe that we all as pilots knew very well that jet engines took about 8 seconds to spool up. That was the case on the B727 when I flew them back in the 70's. I am quite sure it was a lack of knowledge and experience that caused that accident. The A320 was new and no one quite understood it's idiosyncrasies. When I started my training on the A320, I realized how complicated the technology was and understood then why they lost that first one at the show. Remember too that the A320 of today is very different to the one that crashed. Many mods over the years. I don't fault the pilots. The technology was new, difficult to understand and the training possibly inadequate. It's so easy to point fingers after the fact.