After reporting a post, I think that the user who reported the post should get information/feedback on the outcome of their report. Otherwise they do not always know if any action has been taken re/ their report.
I'm not even a moderator but I can tell that would be a pain, and double the time it takes to deal with every single complaint.
Can't you just assume it's dealt with? And if it's not, maybe it didn't warrant any action.
I don't think you need to know about infractions of other posters - that could just make posters target other posters they might want gone who might have racked up a few. It would definitely happen. I would have contemplated it