“Your identity is not derived from the past itself, but rather how it shaped who you are today.” 

… Which is why I was sad to see that I cannot edit posts on this platform 

Access to modify is a core human right, derived from privacy.
It’s the process of saying “hey I was wrong, and what I said in the past no longer reflects who I am today”

This is a process that should be respected and celebrated. 

You should have control to tell your story your way, rather than others telling your story for you.