> I know he's a good guy

That's not an argument. That's what his father would say, or his grandmother.

PS1: What does "good guy" even mean? Most people are "good guys" in that they don't spend their weekends torturing small animals in their attic. Most bad things are done by "good guys" because there isn't enough bad guys to do all the evil that's being done.

PS2: Like many others, I did enjoy / admire his exit letter; but I still have a problem not just with accounting practices at Groupon, but the essence of what Groupon was trying to do.