When you reply to someone, they get a notification (if enabled in their personal settings) that someone has replied. While I don't reply all the time, this thread in particular was about a bug that had been reported fixed in the past. I was concerned it had resurfaced, but you were just misinformed. Normally I would have just let it go there (ignorant profanity laced tirades on the Internet are just cliche), but this particular bug was something people had been misinterpreting as censorship, so I thought a reply was appropriate.