Back when bin-ladden was alive I used to talk about how if terrorists were really such a serious threat worth fighting a war over, Taliban in particular they wouldn't be trying to just do sky-jackings, they'd be trying to decommission infrastructure; this was back when I was a bit left libertarian about 10 years back.
Think for a few moments about what would happen if you destroyed one small city or town's economy by taking down all of the overpasses leading into the city or out of the city. Sounds mighty hard to do right but if you have the resources to train hijackers you could do this somewhat easily; we're talking about taking down 2-3 over-passes at about the same time. Now obviously 9/11 was a home run for Al-Qaeda: some martyrs thousands dead, massive historical event making the organization famous the world over, led to similarly spirited copy-cat orgs, and put the US into it's longest most expensive wars in history, that's a victory considering OBL said he wanted to replicate what the muhj did to the soviets. How does dropping infrastructure compare to that? firstly, re-usable assets, your men will survive to pursue other targets and that will create a persistent fear and paranoia, all of these bridge collapses can be done at range, theoretically you could hide the very intention by stalling out tankers on the bridges and using high caliber rifles to cause spills and then ignite the spills with incendiary rounds, any efforts in prevention are going to be short term, regional or obscenely expensive.
The cost: Building a new highway overpass in my part of the US takes 4-8 months, without traffic and while doing two at once I suspect it could be rushed in 2.5 months but considering niggers, paranoia and if the bridge is actually dropped from it's support we are adding maybe a whole month.
Only 2 highway entrances to a town with ~90,000 pop would cause an economic crash in that small town, essentially you'd be creating an economic regional bubble like flint Michigan and that will cascade outwards but slowly, people's take home will plummet because about 40% commute to work, imagine then if you had also destroyed a great number of the transformers in the town before isolating the stretch of highway before and after the town's exit. you can create a localized economic depression and if down in harsh cold or heat could cause environmental deaths and the deaths of the elderly and infirm. long-term national consequences would be contribution to an insufferable police state causing social tensions and regional wealth disparities that make national economic difficulties in pricing labor and goods but also in wealth inequality.
If sand niggers were serious they would have played the infrastructure game but once you understand industrial accidents your sense of scale changes drastically. Like causing industrial accidents that can literally destroy a whole town in an evening, sugar, manure and certain chemical plants along with oil infrastructure or just causing rail accidents or rail hijackings; simple wildfires, tainted water supplies or pipelines in the middle of nowhere.
You can figure out what sort of hazardous materials are in a train by the signs on the cars, a chlorine tank could wipe out a 5 mile radius easily. All of this is Why I firmly believe we should end immigration and kick out all of the sand niggers.
Starving whole sections of the country and fucking the economy could be done just by destroying sections of east-west rail lines, more targeted abuse could be done DC shooter style but instead of hitting people you take out power infrastructure.
All of this fragility is why a homogeneous society is SO important.