They are pretty dumb, to be fair. Attacking random people without personal reasons hoping it would change the bigger picture is incredibly stupid if you think about it. Which they don't.
They seem to take inspiration from revolutions and such, still not understanding that it took way more than a few incidents of violence and death to actually change things.
The insurgency in Iraq successfully turned America isolationist, to the point that boots on the ground against current threats far more dangerous than Saddam Hussein ever was are out of the question.
A few thousand dollars worth of violence in Europe achieved Brexit, elected right-wing candidates across Europe, closed borders against refugees, and has generally set European governments to the task of creating what ISIS wants: a massive population of disaffected Muslims with nowhere to call home and nothing to lose (to fight its planned holy war).
Terrorism achieves monumental policy changes from enormous institutions which otherwise have titanic inertia, for the price of a handful of operatives and a few grand.
In the wildest dreams of an ambitious US Secretary of State, he might one day have an effect on the state of the world 1/10th the size of what certain modern terrorists have accomplished, for ~7 orders of magnitude more money. Although hopefully in his case, it would be a positive effect.
This strikes me as generally true, except for the "few thousands of dollars" part. Billions flow through these groups, and while an individual attack might only cost a fraction of that, it's probably not fair to consider it in isolation.
Second-rate right wing agitator Paul Nuttall wasnt part of government and was at best a peripheral figure in UK politics, before his resignation.
Hateful professional trolls like Katie Hopkins might have vomited bile to that effect, but iirc Nuttall was the only person even remotely linked to Westminster talking about internment camps as a solution, everybody else dismissed it as a silly idea.
They seem to take inspiration from revolutions and such, still not understanding that it took way more than a few incidents of violence and death to actually change things.