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Being convinced of something by wonky brain chemistry isn't necessarily a personal failing.
Wonky brain chemistry can erase agency.
(As can an empty bank account from an insurance denial!)
If you read the article and see all the shit that he went through before he died it should be obvious that he's not the one at fault for breaking under that pressure. Not everyone has the strength to brave such bullshit.
And I don't agree with the assertions that that's not a possibility.
Why? There are very well treated people who still get suicidal.
We don't know whether brain chemistry alone leads to this. The traits are complex enough that most likely it is a result of social conditioning rather than only genetics. Genetics may still play a role however, especially epigenetics.
There's a big spectrum between "just knowingly a dick" and "deeply delusional".
I say this as someone who has attempted and who knows multiple others who have attempted. None of those attempts were intended to harm anyone. They were meant to put an end to unbearable suffering that had no apparent other way out.