Random thoughts just popped in my head and I just remembered that all the water in a given city is all centralized. Just add poison and boom, eradicated an entire city who are full of dissidents/opposition as punishment for voting the “wrong” way, or for a protest, or if the population is filled with “filthy undesirable [Insert Racial Group Here]”, or something like that.
Kinda unsettling to see that we are all just attached to “the grid” 😖
A very fundamental part of that is the amount of moving parts. Every person in the chain that is required for the thing to happen, has to either support the thing or otherwise follow through.
This very concept is what has saved us from nuclear apocalypse so far. Very literally so.
My city facilitated that a decade or two ago by building new indoor reservoirs specifically for water treatment. Now we have a small handful of facilities set upon for massive chemical insertion and holding about half a day’s worth.
That being said, you’d still need the cooperation of people at each site, security at each site, truckers and suppliers. But that’s only one city: multiply that by the thousands of cities plus now you’d need huge amounts of chemicals that someone would surely question. That’s a lot of moving parts.