I believe that no one wants to die, not as the end of itself at least, just as no one wants to live. It's about avoiding pain and reaching for pleasure (as always, but I'm not certain it ends here). Dying is very scary. Very scary feels very bad and and is a more pressing issue to deal with than other, lesser bad things. Things like food, sex, power and knowledge promote a prospering life. Getting your wants stomped by the laws of nature and by the wants of other living beings, not being fit to serve your nature, being weak, mentally and physically, grief, disaster, sadness, doom, gloom and other similar things are more related to death, dying, losing grip over life. One might spot the pattern and make a conclusion that one wants to live and doesn't want to die... I wouldn't be too hasty about that. It's still a pattern and not a law.
Many humans have grown smart and conscious. Humans started to see that sometimes pleasure now leads to more suffering in the future, and vice versa. Also humans started to spot patterns and predict things. And some humans started to see their own inadequacy/insufficiency, related to the prevalent pain and suffering in their lives. Dying is pain/suffering now, but it's not that unambiguous to us now, thanks to our intelligence.
Religion also sounds like a fix here. It allows the planning man to exist without trying to kill himself. Funny thing, so do the most known philosophies. Which is hardly surprising because we are in the kingdom of the living. (This was the last sentence here btw, and it's where I'll stop for now.)
I think that most now people are capable of understanding suicide because most people do understand the concept of sacrifice (give up something you want to get something you want which is considered more important than the given up thing). Doing exercises so you get the rush of feel good hormones, and look more attractive. Doing job so you can afford food and shelter, so you don't feel bad from starving and sleeping on lice-ridden bed in some dirty place. Behaving on SS so you don't get banished... Same with suicide. One has to confront the bad feelings that arouse in response of approaching death, to get something valued that is believed to happen with/after death and requires death as its prerequisite.
If I were to ask a similar question, I'd probably phrase it as "How many people here consider ctb as the solution to their problems?" (it's not clear where the "truly" part draws the line).