This is one more reason for counter-terrorism strategy as it's currently envisioned being bogus security theater. Ultra-effective, low-risk, completely unsecured and simple to exploit angles of attack haven't ever been attacked, and nobody is even worried about it. You don't see railroads being sabotaged, power lines being cut, or roads being intentionally blocked. You don't see water supplies or manufacturing facilities being attacked. You don't see civil infrastructure being mobbed by faulty paperwork, false claims, or otherwise. You don't see disinformation for the sake of reducing economic efficiency.

Instead, attacks so far have focused on showy but ultimately one-off violent events in which the perpetrators essentially kill themselves, mostly in already high-security areas. It makes a good propaganda bit for both sides, but doesn't actually impede function. I suppose it's a good thing that prospective jihadis aren't motivated by charts showing decreased output.