Many users, and maybe most outside HN, either: * don't care about the misformatting * actually want the red font and underlining from the web page they're copying from.
They want the red font more often than they just want the text, and don't get annoyed when their email now is all in red Impact font? These oft-mentioned mythical users that have opposite expectations from their computer than us are a bit like the Sasquatch. Some say they've seen them, but I still don't believe it. :-)
"Can you show me how to make a chart in Excel again?"