Do you also not take Alan Turing's works seriously?
The useful discussion is "Is this person's way of thinking probably going to help me improve my life?"—if someone committed suicide, I would think twice about thinking similarly to that person.
To illustrate why, I'm depressed. I don't have direct control over this. But I do have some control over what I think. If I bow to the thoughts "this life is not worth living", yeah, I become more likely to slit my wrists. But if I think "I'm not going to identify with these thoughts. I'm going to eat lunch and that will probably make me feel better", I think my life will be longer and better.
Not saying you can think yourself out of clinical depression, but I'm going to be careful about what I decide to think, and who I'm going to model in my thinking.
DFW was kind of a loser, imho, who abused his girlfriend and her son.
Consider all the love and respect directed at Robin Williams after he died. The perverse reality is that for someone in a suicidal frame of mind, that kind of love makes "I'd be better off dead" far more credible.
I think the other extreme, outright condemning someone, probably doesn't work either, as it's liable to make a person with suicidal feelings feel trapped.
So I settle for disapproval, that suicide is a permanent stain on someone's legacy, in the hope that it nudges someone to stick it out for another day.