I heard about it on a local radio show, at first I thought the guys were joking, got into work and the boss brought in a 12 inch black and white tv. Watched the footage. The world was spinning, no-one knew what was going on. The same scene kept repeating on the TV and new ones came up as new footage came in, took hours and hours. When I got home after work, I went next door to the neighbours and watched it on their cable. I knew things would change at airports, there was a hollowness about the future at that time.
On Netflix there is a documentary on 9-11. Some of it were interviews on the 10th anniversary of the attack. The documentary's covered the invasion of Afghanistan, and the ongoing fuck up of Western Forces being there. A lost cause, mostly due to the invasion of Iraq, which took away from reforming Afghanistan.
In the last few months the drive to rescue Afghan interpreters and employed workers for foreign armed forces, was a disaster, with still many Afghans fearing for their lives. If in the future, that Afghanistan produces more western terrorist's attacks; The future might be very bright and radioactive for them...14-20 well placed bombs could isolate Afghanistan forever, poisoning the environment for the next 100 years. This will be the primary option the US will take if ever attacked again. Reasoning they will not want to do what they had been doing for the last 20 years.
The US since WW2 has been active in the world at large, in order to secure its peace from attack. 9-11 caught them with their pants down. The US response was massive and very misguided. Overall, it was a shit show.
Alot of it was the lack of consensus between different elected presidents and their own parties divided opinions. These politicians did not listen to the experts and thus trashed and fucked up everything.
The biggest thing was the Obama administration bringing in more military to control things (on a military adviser's opinion), when they should of brought in humanitarian relief, and built schools and roads to support an economy that would work for them. The idea would be to teach them how to fish, not just give them food (metaphor). They should of started everything on the local level (local elections and mayors and councils and legislatures), and built to the "state"/provincial level and finally to the country level.
The Taliban will crush the people of Afghanistan and will enslave the people of Afghanistan. Afghanistan only export will be heroin, which will be exported in bulk to the US and Western Allies. So expect to see a rise of heroin imports into western countries coming through Chinese companies and shipping lines.