i will start with an appeal to mr. connellan to correct me if i misconstrue the point he is trying to making, and i apologize in advance for the hypotheticals and the poor organization.
our natural 'feel good' systems which kick in when we do something that increases the replication of our genes
so the experience of "fun" is bait to lure humans into reproduction? what about people who have "fun" on rollercoasters or sky diving?
The unhappy feelings have evolved to deter us from whatever caused them but they might get so strong as to end ones life.
i hold that society is at the root of much of the world's unhappiness, but since societal interaction is a behavior in which so many of us humans engage, it would seem [according to the notion that all human actions are advantageous to human survival] that society can/ought not cause unhappiness in humans?
Because as we all know the conditions (mental states) which lead to suicide are definitely no longer adaptive, these will be weaned out from our genetic make-up.
talking about depression and general insanity i take it. okay, i will grant that certain people do have a genetic predisposition toward depression, however, i would argue that given the proper conditions any human being can become depressed. suppose that you had a happy hypothetical family living in a fine hypothetical house. one day, a hypothetical fire destroys your house and incinerates your family. you, meanwhile are left with massive burns, and massive hospital bills, homeless, family-less, currently unable to work due to your injuries. that would sure depress all hell out of me.
also, suppose i shot myself in the head, and had my next of kin mail you my death certificate just to prove you wrong. would that make me insane? *ahem* don't mind me, i have been awake for the past seventy hours or so, and i think it is starting to affect my cognitive functions.
it seems to me that at the heart of our disagreement is the issue of motivation, whether it be evolutionary programming, the subconscious, or free will. i personally think that humans do indeed have free will. so long as i can make the choice to end my life, this will continue to be the case.