Is fear of death innate or is it a social construct?

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So I was reading a page the other day of unique ways to kill yourself. I found myself laughing pretty hard. It occurred to me that if after only 5 mins of seeing suicide in a funny context, I could see suicide as funny, then what would happen if I always saw suicide as funny? Or better yet, as honorable, like in Japan? In America, suicide is considered weak, selfish and extremely sad. From the time we're alive, whenever we hear of suicide, it's in the context of extreme sadness, and therefore we are extremely afraid of death. But what if from the time you were alive, you only saw suicide as honorable? This brings up another question, what if the same could be said for death? This sort of reminds me of suicide bombers in Palestine. They're genuinely happy to die and their friends are happy for them as well. Mothers dream of their children being "martyrs." Looking at death in this context, you see how much of a social construct it is. Thus, this begs the question-- is our fear of death a social construct as well? Or is it merely an extension of the society's view on death in which we live? Just food for thought...I'd guess it's innate. I just found it interesting to realize how much of a social construct our attitude toward death is.