Interestingly there is a recent case in the US where a girl has been charged & sentenced for convincing her boyfriend to go through with killing himself.
It is a slippery slope (& again, freedom of speech has been quoted as having been infringed upon in this case) but when should responsibility be considered diminished?
The girl knew the deceased intimately, knew he suffered poor mental health, knew he'd tried to kill himself previously but hadn't gone through with it.
Yet when he called & texted her during his last attempt to kill himself & showed signs of not wanting to go through with it, instead of providing support & encouraging him not to do it, she did the exact opposite & literally shamed & pressured him into killing himself.
That to me is responsibility for his death.