Unsure why you’re getting downvoted (this is “No Stupid Questions”, after all), but I’ll give my 5 cents:

Reason 1:
The people is essentially the reason why a government has power. Without the people (and their support), the government governs a whole lot of nothing, and they will be forced to do labour themselves.

Reason 2:
Poisoning the water is not very accurate, and may lead to both the death of many whom already are supportive of the government (which will create distrust), and people only getting sick depending on the amount they drink (the dose makes the poison).

Reason 3:
Despite a population having a lot of dissidents, these people still work and contribute to society in some ways. It has to get pretty bad before it will be “worth it” to remove them from society.

Reason 4:
Even if it’s so bad that you’re looking at an open revolt against the government, poisoning the water will only really yield MAD, which is usually undesirable.

Ultimately, it’s unlikely desirable for any government to do this, as there are better ways (for the government). However, there have been some attempts at genocide through water supplies before, so it’s not completely unheard of. Check out Project Coast.

I just now realized that the monkeys have this capability (reference StackOverflow), and this does open for some fun experimentation. Have you by any chance used a userscript for such a purpose before?

Yeah, a bit of an xy problem, I’ll admit. My ultimate goal would be invisible blocking/hiding from certain expected behaviors like the ones anti-adblockers employ. I’m not sure if what I have in mind specifically exists or not, but I find it fun to tweak and experiment with these kind of things. So I don’t necessarily have a problem I’d like to solve, it’s more an ask for directions/experiences.

I have tried Fiddler before, and it almost has the capabilities I’m looking for (it replaces an entire file; nothing granular), but it was a bit of a hassle to get working well last time I tried it, with the CA certificate, decrypting the TLS and stuff.

I haven’t heard of ZAP before, so this is new and intriguing! Thanks!

uBlock Origin I very much like, and I think it’s near-impossible for me to use a browser without it installed anymore. But as far as I know, it’s only used for blocking (dropping network requests) and hiding (CSS-like rules), but no manipulation?

The monkeys I’ve also used a little bit of, but I wasn’t aware that they supported being run ahead of the rest of the page like how I wanted, so this is definitely worth looking into, I appreciate it!
For reference, I found this answer on StackOverflow, which is promising.

I most likely am going a bit to the obscure/convoluted solution, yes.

My goal is to do something to the effect of uBlock Origin, but instead of just blocking/hiding, either replace with local files, or intercept req/res in order to manipulate them favorably, without being detected. I don’t know what uBlock does under the hood though, apart from its resource blocking and CSS-derived hiding.

Example:
Watching a video on youtube, an ad is about to get loaded, but instead of the hiding/blocking strategy uBlock uses, intercept the GET/POST, save the important flags that are uniquely served to your device that would indicate that you have successfully been served the ad, drop the rest, and then answer with what would be a valid response for “I have watched the ad in its entirety”.
So the server basically saying “Here, I give you this page and this script with both vital and ad contents. I now expect you to provide the corresponding hash that these two files will create through a series of functions. If you don’t, I will assume you’re blocking me, and I won’t provide further contents.”, and I’ll simply respond with “Here’s your hash! *wink*”.

Essentially, I wish to experiment with trying to be completely invisible in the blocking, by providing responses as if I have loaded and watched the ad, with all anti-adblock implementations through scripts and dynamic loading “intact” and unaware.

You’re quite right, I should include my goal in the post - editing it in now.

Depends on the conditions, I’d say. If you have an area that has low oxygen and high saline concentration, one could potentially preserve large parts of the carcass. A big challenge though is the substances brought by the carcass itself, like enzymes and bacteria that are not directly exposed to the oxygen-deficient saline-abundant water, which can thrive and remain active for a long period of time. However, if this carcass sinks to incredible depths, where the pressure is really high, temperature is a constant 4 degrees, very low concentration of scavengers or thriving organisms, and potentially sinks a bit into the sediment for a long time, you’ll essentially get pickle juice fossil fuel.

They only recently made it mandatory for three visa types, but since introduced in October 2016, it’s always been an optional field when applying for an ESTA.

Edit:
Not that not providing your social media handle will benefit you, of course.