Conversely things like not being taught how to have proper relationships, being taught how to ask for help, or things (for men) toxic masculinity are potentially trauma inducing in social creatures as humans are.
The 'taking responsibility for ones own life' has a perverse failure mode where an individual is genuinely incapable of doing something, yet at the same time incapable of seeking help for the issue. These tend to lead to harmful downward spirals in those peoples lives.
Not discounting that some people have terrible childhoods that are legitimately damaging, but losing a pet or a friend moving away or a grandparent dying is not that unusual and well within the scope of "normal things that happen" that normal people can (or should be expected to) handle.