Suicide, in some form or other, exists in every society, even among animals.
There are a lot of animals that, when caught wild, will stop eating until they are released or die. The equivalence of liberty and life goes much deeper than any speech by a politician or philosopher. The natural state of life is to correlate with liberty and conversely loss of liberty naturally correlates with death. Many species, including humans, must be specifically socialized to tolerate, or even enjoy, reduced liberty. Note that liberty is very similar to temenos.
People in technological societies tend to add things on to suicide that are not naturally a part of it, and leave out other things that are. So a more clear definition is helpful.
A very basic definition of suicide is simply "The choice to move toward death".
In a consumer culture, the focus is always on maintaining one's relationships with the fruits of productivity. The purpose of the body becomes "to enjoy products" rather than to serve some higher (i.e., spiritual) function.
Ignoring higher functions does not diminish those functions, rather it diminishes the one that ignores them. A person who gives up their nature for some unnatural societal benefit will live a long drawn out suicide, and that is the norm for many people.
It's important to understand that attraction to death balances attraction to life.
The notion that "Life is good, and death is bad" is unbalanced and short sighted. A healthier ideal is "Life has its time and death as well".
As a general rule, a person can say it is natural and healthy for nature to be the arbiter of life and death. If you have a deadly cancer, nature has put you toward death. If someone approaches with a cure, nature has pulled death back a bit. etc.
The conscious choice to end one's life is usually viewed as a psychological frailty, but it is always the result of a calculation that can be understood.
Freud postulated the theory of Thanatos, or the "death drive" to balance the Libido or "life drive". The deduction can be made easily, everything must be balanced by something, but the description is harder to complete. The two obvious choices would be a) Thanatos as the lack of libido. This would require libido to be balanced in itself. or b) Thanatos as the balancer of libido.
From similar riddles, a person can say that the choice (a or b) is a matter of perceptions. Some people will understand the solution (properly) as "a", others as "b".
The first choice, Thanatos as the lack of libido, rules out the choice of death. It portrays what would be called by anyone "suicide as a natural death".
So in looking at suicide from a psychological perspective it is probably most useful to see the death drive as something balancing libido, something in a process or relationship with libido.