No, it didn't. Or, at least, it needn't have. 3,000 people died. Yes, it's tragic, but it's much less tragic than the hundreds of millions of others who have died since.
No matter how unlikely an extreme event might be, if/when it does occur it has earth shattering effects due to the complexity of the world. This is why we need to be so vigilant in protecting ourselves against these threats.
I finished with "But September 11th came along and changed the West and Middle East for decades." That is the point. 9/11 was tragic enough, but it triggered an avalanche of death and trillions of dollars spent. These sort of attacks have non-linear effects that cannot be predicted.
You originally stated you are more likely to die falling down the stairs therefore "Bomb attacks are not something you should be concerned by." My response is that terror attacks are like what we see in 9/11. Considering that event resulted in hundreds of millions of death due to the complexities of the world AND the risk distribution and magnitude is completely incomparable to known risks and their distributions, it is nonsense to dismiss the risks as you are more likely to die falling down the stairs.
I absolutely feel your frustration. I share your basic outlook. But most people don't. You're not smarter, you're just not as easy to activate emotionally as they are. That's why advertising and propaganda in general doesn't consist of long earnest rational arguments of the sort found in academic journals. It consists of atavistic emotional manipulation because that is what works most reliably.
Has anyone ever handed you a political flyer that consisted of a wall of text that you glanced at but didn't bother to read because you just couldn't be bothered to navigate >1000 words of half-baked political theory that didn't really speak to you as an individual? Well that's how your arguments come across to most regular folk.
Being right is not important if you can't get people to pay attention. Citing comparative statistics is a wonderful way to get people to ignore you.