They are looking for peace, and in their view death can offer that
Depression is a very prevalent disease in today's society and is very difficult to treat.
It is difficult to bring back a person who thinks that the only way to peace is death.
As tht said "People in places where the level of wealth is low say, "I haven't enjoyed life yet, I have to live" and don't want to die.", probably makes sense.
The poor hope for the rest of their lives that they will live better someday, while the richer ones quickly realize that they won't, so they quickly surrender to complete depression.
We now have a friend who had a beautiful life, part of it she spent in Sydney, where her son now lives with his family, and she is currently in a psychiatric institution. Severe depression, and my sister, who had a catastrophic hard life (she was fatherless as a child, worked two jobs for years...), but she doesn't give up.
But whether rich or poor, the one who is depressed and thinks about finding peace, can find it in another place than death.
If he does not have the support of his family and environment, he can leave his previous way of life and find peace in nature, by the sea, lake, mountain, forest. He can engage in charity work, to find a purpose in another place, if he does not find it in his current life... To spend the values he has acquired in his life in any place for life, not for death.