Of course they’re not going to stop doing it. Which is why it’s a pointless “war” you can’t win. As long as we have lots of energy and technology (that produces things like bombs) at the disposal of individuals, who are either crazy loons or determined fanatics or possibly just extremely irate people we have injured, we will have terrorism. The only way to stop it is to 1) get rid of this having lots of energy available to the average person (i.e., go back to the dark ages), 2) seek out every person with mental health issues and treat them or lock them away (applies to fanatics also), and/or stop pissing people off with stupid political, military, or business decisions (which, by the way, seemed to have all congealed into a big monstrous blob).
What you have to do is be precise and smart and legal, which the US has been atrociously bad at.
Furthermore, we have totally forgotten the other side of the coin. The goal of these people is to terrorize people. In the US, they have succeeded beyond their wildest dreams. Instead of trying to calm people down (remember the “Keep Calm and Carry On” posters in Britain during WWII?), and reminding them that their chances of getting hurt by terrorists is exceedingly small, conservatives in particular have done everything they possibly can to keep people scared, for political, power, and buckets-of-money reasons. Absolutely no effort is being made that I can see to remind people we are safer than ever, from disease, pollution, starvation, etc. That is, until the Republicans majority gets their hands on it.