a lot of people's sense of self-reflection is skewed, i've seen people very close to me with an entirely broken sense of self reflection which usually just manifests as self-victimization
it has dumbfounded me at times because I, as you, thought everyone has some sense of it and if they saw it they might change; but alas not always the case
I agree that the quality of self reflection, and the quality of the outcome, varies.
There is difference between having the ability to self-reflect, and having a proclivity to self-reflect. Neither is the same as doing so effectively, and neither speaks to the question of having a motive to make further personal changes as a result.
The comment to which I was responding categorically denied certain people from having even the ability. Ever.
Nearly everyone is capable of self reflection. To think that an individual is categorically incapable of it is to deny them their humanity.