Tear gas is not bad at all. It is just banned in war because they bammed all forms of gas warfare.
That's simply not true. It can be very dangerous, when not used correctly. Which can routinely often when just fired into crowds.
....what? How is it dangerous?
Tear gas, formally known as a lachrymator agent or lachrymator (from the Latin lacrima, meaning "tear"), sometimes colloquially known as mace,[NB 1] is a chemical weapon that causes severe eye and respiratory pain, skin irritation, bleeding, and even blindness.
As with all non-lethal, or less-lethal weapons, there is some risk of serious permanent injury or death when tear gas is used.[6][7][1] This includes risks from being hit by tear gas cartridges, which include severe bruising, loss of eyesight, skull fracture, and even death.[8] A case of serious vascular injury from tear gas shells has also been reported from Iran, with high rates of associated nerve injury (44%) and amputation (17%),[9] as well as instances of head injuries in young people.[10]
While the medical consequences of the gases themselves are typically limited to minor skin inflammation, delayed complications are also possible: people with pre-existing respiratory conditions such as asthma, who are particularly at risk, are likely to need medical attention[2] and may sometimes require hospitalization or even ventilation support.[11] Skin exposure to CS may cause chemical burns[12] or induce allergic contact dermatitis.[2][3] When people are hit at close range or are severely exposed, eye injuries involving scarring of the cornea can lead to a permanent loss in visual acuity.[13] Frequent or high levels of exposure carry increased risks of respiratory illness.[1]
There is plenty of danger with them, ultimately.
Sounds no more dangerous than just walking outside. ---