I believe that if you are going to post threads on here you have to accept that you aren't always guaranteed to recieve a reply, it's nothing personal against you and it doesn't mean that anyone else is doing anything wrong, nobody on here is obligated to post at all, it's a personal decision deciding whether to reply to a thread.
Like I understand why someone would get upset about not recieving a response that they so desperately wished for but it just sounds like you have too high expectations for this site and for other people, I don't believe that other people especially on the internet can be relied on in general.
And if you have a specific question that you really want an answer to then I think it's better to write it in the title so people can see what you are looking for just by scrolling the forum list and it's true that often threads get buried as many people use this site, it's no-one's fault, it's just the nature of the site.
And I also think that threads marked as venting that aren't asking a question in the title are less likely to recieve replies in my opinion as I think a lot of people assume that venting threads aren't necessarily looking for responses, I'm not saying that's always the case, but I believe many people scroll past them as they think the person writing it is just expressing their feelings on the only place they can be open about suicide related subjects.