Carrie, I agree with the others. I'm sure your post had nothing to do with what happened to Nero. It's a natural human reaction to go over your interactions with someone after they die and try to figure out if there's something you could have done differently; to wonder if there's something you could have done to prevent it. I've felt that way, too. So many people in this thread have mentioned how they saw Nero's posts and always wanted to PM him. Well, I was one of the ones who did exchange PMs with him. Shortly before the last time he logged off the site. In one of those PMs I asked him if he was okay, to which he didn't respond, but responded to a different PM later. It's easy to look back on that now and feel guilt that I should have pressed harder to make sure he was okay, or let him know that I was there if he needed me, or... something. But the reality is, I don't know what happened to Nero. I don't know why he died. He might not have been trying to avoid answering that PM at all. It might have just slipped his mind, as often does mine, or any number of things. Even the notion that his death was in any way intentional, as far as I can see, is just speculation.
So please don't feel bad. I'm sure your post in no way contributed to what happened that night. If anything, your post probably made him smile, seeing as he gave you a +1 for it. Hold onto that image, instead. The image of him smiling because of something you said.