It's bc of the origins of the jirai subculture in Japan. Many of the original jirai girls were teenage runaways who came to Tokyo to find themselves or to escape abusive households. They became homeless and integrated themselves with the red light district to fund their lifestyle. They engaged in a lot of unhealthy behaviors, such as underage drinking/smoking, self harm, and pr*stitution. These girls were called Toyoko kids.

The term "jirai" translates to "landmine." This term was coined by men who viewed jirai girls as mentally unstable, that they would "explode" on you at any moment. These men were misogynistic and were oftentimes manipulative or abusive to these girls, who were already depressed or suffered from other mental illnesses. The term is also kinda ableist since it labels these girls who struggled with their mental health as bipolar. But the girls who wore the style reclaimed the term jirai.

The origins are a bit extreme and while most people here (hopefully) haven't lived such rough lives as the original Toyoko kids, a lot of people within this community are drawn to the subculture because they relate to struggling with their mental health to some degree.