In the case of Murdock we really just don't know enough to make any sort of judgment about his twitter posts.
We know he was arrested, treated by EMTs, and bailed out of jail.
We have reports that he was drunk but there is no verification of that.
We know he died and that's about it. We need more facts to really understand why he died.
I agree that if he was facing potential jail over the tickets and arrest and killed himself because of that then it's truly an irrational tragedy. I suspect there was a lot more going on.
With regards to suicide, as someone who has personally experienced severe depression and most of the range of suicide ideation, I can tell you that you are very mistaken. Suicide and suicidal thoughts can be both rational and irrational. Hardship, short or long-term, is not even necessary.
Thoughts of self-harm can be sporadic irrational desires that sneak up on you unwanted, and unacted on, sort of like a craving for junk food that you ignore.
These sorts of thoughts, at least in my experience, don't have to be in response to short-term hardship and certainly not because one doesn't want to deal with something. Many medications even warn about giving them to teenagers because they are correlated with an increase in such thoughts.
My understanding is that they're also the least serious form of suicidal ideation. I'd guess that they're simply a chemistry fuck-up. It's pretty amazing that we're theoretically conscious self-determining beings in a (mostly?) deterministic universe so a few glitches are ok with me.
Ending your life because of such urges doesn't make any sense and it is truly tragic if anyone dies from that.
Thoughts of ending your life can also be well-thought out and quite rational. You can end up playing in your head what you think your future will be like, even if you persevere, and seeing only more suffering. Your judgment on the issue might be sound or it might not be
I haven't personally experienced severe, incurable, chronic pain or a terminal illness so I can't pretend to understand that mental state. I know that most non-religious people would agree that there is nothing wrong with ending your life with dignity in the face of terminal illness.
I suspect that the U.S. hospice system has a lot of "dirty" little practical secrets where overdoses are given to ease suffering and speed up dying -- which would not be politically acceptable by the religious masses.
I can say that I have dealt with illness and lifestyle changes that ended up with me taking both a very irrational/emotional and rational look at the new path of my life and if taking it was acceptable to me.
First, rationally, life has no meaning and is pointless (unless you irrationally believe in religion.) The obvious purpose of the state of life might be existence but almost certainly nothing you do will matter and in a few billion years humanity won't exist anymore. As the saying goes: life's a bitch and then you die.
That said, one sometimes has to find or give their own meaning to life. I personally think the meaning of life is to enjoy yourself (and before you think that's selfish -- I find joy in others finding joy.)
In the absence of ability to do that either due to environment or emotional state then suicide can certainly seem like the rational choice.
I think the strongest rational argument against suicide is that, statistically, one probably enjoyed life at some point and thus continued existence holds the chance of enjoying life again. Hell, even people with terminal illnesses sometimes survive.
Lastly, it's really hard to talk about suicide in our society because of how it's reacted to by authorities. People get angry at those who commit suicide, frequently calling the deceased selfish, and asking why the person didn't just talk to them.
Well, if you talk to someone and then they go behind your back to the authorities because they don't agree with you, you can end up losing (at least in the short term) your right to self-determination.
So when someone is facing depression and/or suicidal thoughts they're also facing guilt. As if distraught people really need more negative emotions to deal with.
It's really a shame that people who need help get treated so ham-handedly.
And it seems a bit weird to separate out suicide from other forms of death as selfish. Everyone you know is going to die at some point and, unless you die first, you're going to have to face their death and missing them. They're effectively calling others selfish for dying before them. How rude!
So, I guess that was a long-winded way of saying suicide is complicated and rational and irrational -- much like everything else we humans do. Sometimes it's a tragedy and sometimes it's a relief in the face of the inevitable.
We miss those who are gone regardless.