This is the kind of comment I enjoy on here. Thank you for sharing your human experience.
I am not sure when the idea of nature/nurture will be put to rest, I have accepted it but it also has very strange philosophical ideas, like the idea of how laws are made making assumptions about humans, but what if the humans are not knowledgeable or understand what they are doing, or have different values? We already have laws for disabled or other classes of humans, and also temporarily insane. This brings up very interesting points on how equality is not equal, how laws are complex for the purpose of gaming them by those of higher intelligence or memory of obscure facts.
Genetics has a lot to do with who we are, our race/looks, height, thoughts/intelligence even. Yet many cling to the idea that nurture can overcome nature. Our mtDNA and Y chromosome is the hardware our consciousness runs on. Just the way we are, not a strong or a weak thing you say, there are mutations in us, some are beneficial, some are good/bad, but I disagree, of course some are weak or objectively bad. Hotwheels from 8chan made a good post about how he doesn't like his existence and would support euthanasia for people like himself. I doubt anyone would want to be born with tay-sachs, and when you say not strong/weak you may be using a surviorship bias to say it, although most humans are on average quite healthy.
I was originally going to post how I had the opposite reaction to an event like this like you, a car crash when I lost control in the rain, thinking I was about to die. I didn't and I was mostly fine aside from some back pain from whiplash. I have aphatasia, do you happen to have it? I have a bad memory so I don't think people with it can get PTSD, so it is an adaptive mechanism, although I lose a lot of richness in thought I suppose I have been through really bad things with no problems, had a gun pointed at me, demanded my stuff, and I said no, he was confused and didn't really know what to do, I left. I didn't really think much of it but others thought it was crazy. No PTSD either.