What have I done?

Imagine a bunch of talented kids who are very good in math and science.  They go to college where they learn more about science, and delve deep into science.  They then begin to apply that science and assist in the development of products.

So far, so good, right?

Are you sure?

What if they are not developing products that help humanity, but hurt humanity?

Especially if they do this in democratic societies. Scientists and technologists being pressured by dictators is an entirely different topic.

So, in free societies, if these talented kids grow up and then voluntarily assist in the development of products that hurt humanity, then ... isn't there something wrong with this picture?

Yes, of course, plenty of people have thought about this, written about this, talked about this.  But, I am always at a loss imagining how individuals willingly choose to participate in something that they know will not be the best for humanity.

When I saw photographs of women and children also being tear gassed at the US-Mexico border, I couldn't stop wondering what makes people develop such tools. 

Source

And then the nerd in me wondered what tear gas is; the oracle that the internet is delivers right away: "they’re not gases; they’re powders that billow into the air as a fine mist."

I had no idea.  I thought they literally shot gas into the crowds!

So, what happens when one is on the receiving end?

Before the tearing, the choking and the pouring mucus, tear gas burns. It causes searing pain in the eyes, skin, lungs and mouth—or anywhere it touches. “It can be overwhelming and incapacitating. You can be forced to shut your eyes and cannot open them,” says Sven-Eric Jordt, an anesthesiologist at Duke University. And then comes the coughing and the nausea and the vomiting.

Now, think about this: These are not found naturally, but are manufactured by humans.  A bunch of talented nerds had nothing better to do than to create tear gas?

Tear gas agents activate one of two pain receptors, TRPA1 or TRPV1,

The first category, TRPA1-activating agents, includes the chemical called 2-chlorobenzalmalonitrile or CS gas. This is one of the agents used by U.S. law enforcement and, according to a U.S. Customs and Border Protection spokesperson, is what CBP officers fired into crowds of men, women and children at the U.S. southern border on Sunday. “A lot of children fainted. My daughter also got hit. There were pregnant women there and a lot of older men, too,” a witness told the Washington Post on camera on Monday. 

It affects children a lot worse.  Why?

Children are particularly at a high risk for injuries from these agents, Jordt says, because they are so small. “They are shorter, and there are increased concentrations are near the ground. They also have a smaller body surface and lungs so the potential for injury is higher,” he says.

Apparently such a chemical ain't enough!

“More and more, there’s a higher-level version called CS2 or sometimes CX,” she says. “They [contain silicon] so that they can last longer in the environment and don’t disintegrate as quickly.” The result is a more harmful tear gas that can continue to affect an area for several days.

How awful!

Keep in mind the two pain receptors, TRPA1 or TRPV1.  Before we learn about the other one, anything else?

There are two other TRPA1-activating agents used for riot control: CR gas (dibenzoxazepine) and CN gas (chloroacetophenone, also used in bear spray). Both are more potent than CS gas, Jordt says.

Ok, can we move on to the other one?

There are two compounds in common use in this category: OC gas, a concentrated solution of natural capsaicin, and PAVA, a mix of synthetic capsaicin also used by U.S. Customs and Border Protection. “This has fewer chemical or allergic reactions, but it’s also an oil so it’s much harder to get off and can last longer,” Haar says. “It can also cause corneal abrasions if you’re shooting it directly into someone’s eyes.”

This is insane!  "Haar says that there are almost no scenarios where the use of tear gas makes sense for controlling crowds."

But, worryingly, this is perhaps the new normal :(