That time period following the attacks was surreal. People were very scared of any plane noises, and a brown-skinned terrorist was imagined lurking around every corner. Then the anthrax attacks happened, and the DC sniper attacks too. It felt like the USA was paralyzed by fear, so I can at least appreciate the atmosphere that led to the "patriot" act and other rights-eroding laws.
COVID-19 felt like a natural disaster to me, with effects that are bad but not from malicious intent (ignoring the actions of various groups, I mean). The WTC attack and subsequent terrorism felt different, as they were caused by humans to inflict fear and chaos on us. It's amazing to me how different those 2 events felt.