Well, I feel others here are doing the right thing by sharing their abuse stories, which is making an effort to reach out to others for help, rather than just doing what my relatives did: taking their childhood abuse out on their children or spouse; putting the burden of their past hurt onto their children; expecting their young children to be their marriage counsellor, trying to pit them against their other parent.
It's the reason why therapists and psychologists earn degrees in studying the way people behave and why they do things: it helps them help their clients who might not be able to reflect or understand their own emotions, their past, etc., which helps them change their behavior. Reflecting on why my relatives were abusive helped me realize and understand that I didn't want to act or repeat the generational abuse that apparently had been going on, and it's helped me work on healing myself.
Also, not everyone's life situation is the same: some people might not have a car or even public transportation where they live, in order to drive themselves to see a therapist; some might be unemployed and unable to afford one; and some might've already tried seeing a therapist or getting help from several adults who chose not to help. So, perhaps, they've all decided to try working on helping themselves as best as they can, by asking for help on the internet and reading therapists' articles.
Maybe some aren't whining about their past, but are just trying to build rapport with others, feeling that mentioning their own painful past or past struggles might help others not feel alone with their own situation.