Why not delete the comment too, since it is completely unnecessary?
The solution is: we don't delete comments outright unless the author asks us to. The most we'll do is kill them, which means they get marked as [dead] and are visible to users with 'showdead' set to 'yes' in their profile.
That's why I turned showdead on, but I find it's also helpful to calibrate to the norms of the community. I'd recommend everyone at least be aware of the option and give it a try for a bit.
Also if all this is documented somewhere, please feel free to point me to it. I couldn't find any on my own.