While that is true, it's usually not the reason for suicide attempts.
Like with many people, it's depression. And it's mainly undiagnosed, because their management company probably doesn't really care about mental health as much as physical health. (Injuries mean idols can't dance/sing, meaning they can't perform live, meaning they can't make money. But depression is an invisible illness, so it gets ignored.) Or the idols are in denial about having depression in the first place.
In the case of female idols, there's one other major factor; netizens. Specifically haters that post hate-filled screeds on any/every social media about any little thing the idol says or does that deviates from how they're "supposed to be/act". And those screeds are echoed and supported by other haters, and just build up around anything having to do with the idols.
For Hara, there were a couple of other factors. One is a still on-going legal battle with an ex-boyfriend. He was found guilty of crimes including physical assault (However, she was the one originally investigated for assault on him, since she defended herself and she was the one that got "reported" to the police. She never denied hitting him, but claimed it was a two-sided affair; the details of which led to the other charges against him), property damages, threatening (blackmail), and unnecessary force. But the charge of sexual assault in the form of filming illegal footage was dismissed, because she supposedly knew about the footage and did not ask for it to be immediately deleted. However, both sides appealed the decision; his side wanting to get him a lighter sentence than the 18 months given (with a 3-year probation period to follow), and her side trying to get the sexual assault charges to stick.
The other factor was that Hara was a close friend of Sulli, the previous suicide.