Alright, let's end this argument. Here's the website for the American Foundation of Suicide Prevention, specifically the page about research findings:
https://www.afsp.org/understanding-s...earch-findings
According to them, 90% of suicide victims had mental illnesses. That's a very clear majority, but by no means a totality. They also elaborate that there are many people who attempt to commit suicide due to their life situation, despite not previously being mentally ill or having a history of such, like people who don't want their families to have to pay expensive medical bills for a terminal illness.
So in a way, everyone is right. Mental illness is the leading cause of suicide, but there are other causes as well. Now, let's all go back to our lives.