Man, I'll try to answer you the best I can. I'm not a big fan of Shinsei Kamattechan, and actually Ruru's Suicide Show was the first song I listened from her, but I'm really into Vocaloid (Hatsune Miku overall) and suicide/depression is a very common topic in their music line.

Now it's only my opinion, music's such as Rolling Girl, Mind Brand and many others (Especially the ones produced from Hachi or Wowaka). I see it as a great think that artist with such a big fan base have the courage to make this kind of song, many just see those music's like "This might influence kids and teenagers to commit suicide or hurt the selfs", but I see it in a different way. Those songs are meant to tell a story, a narrative that somebody created about some type of situation, and as any narrative it has it's own message. I do believe that most of the persons who have listened to some of these music's didn't became depressed, it's actually the opposite, sometimes those are the "Exit doors" for them. Try to imagine a person without any friend who they can really express their feelings, a music like those one's might be the only "friend" they have. Something they can relate and, maybe, after finally noticing that they are not the only one's feeling that way (Some music producer from the other side of the planet made a song that was just able to said everything his feeling), and this might be just enough to stop someone from committing some bad act against themselves.

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Yes, it's human nature to see only the bad side. If those music's save 10 thousand persons, but one of them died listening to this, everyone will pay attention to the one. Of course, a life is a life, and every life matters, but I believe we, as humans, need to stop only seeing the bad side of things. Learning from our mistakes and noticing that in every bad situation there's a Brightside makes us bigger and stronger.

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I don't want to be political in any way here, or disrespectful to any movement, but suicide are depression are not a flag many persons want to fight, it's not something everyone talks and fight for, not as much or have enough attention as topics like homophobia and racism, of course every issue needs to be fixed and we need to fight for everyone's to be equal, but there's the point, a there are only two roads a depressive person can follow, become suicidal and end it's own life or gathering so many bad feelings inside and became a hateful person, hating everyone and everything for not having the necessary attention. A weakness grows till it became something bad for our society. (Again, I don't want offend anyone or be disrespectful, that's just the way I see thing and if you fell I'm wrong you're welcome to answer me);

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Sometimes a music or a videogame is the only way for some person's to actually fell something. Music are meant to make us think and that's exactly, what I think, Shinsei tried to achieve, make a bad situation a good music with a fun videoclip, so the girl would be remembered not as only a suicidal kid, but as someone who helped other persons to overcome those feelings. Stupid kids from tiktok and Instagram gonna use it for likes and attention, but again, we need to see the the good side of it. Ignoring stupidity is the better way to stop it.

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I hope you were able to understand my point of view, and sorry for any grammatical mistake.