Because sometimes it's not a bot and on actual human with a shitty, shitty job. And those two keystrokes may actually mean the difference between them feeling shitty or not as shitty.
I do, even if it's a bot, because maybe it's not. I have worked on 2nd+ line tech support, and I'd often see 1st line getting mistreated by customers. I could never do 1st line.