I'll remove this post in a little bit.

After any interactions have been made, it is no longer possible to remove a post from the blockchain.

In cases such as that, your only option would be to edit the post to remove whichever thing it is you wanted to delete. The only ways around this limitation... are rather extreme. If it seems strange, just think of it like taking away the power of a post creator having authority to delete responses, since those responses (and votes) are attached to the post itself.