I disagree. Every business owner makes mistakes.
I agree. I don't think there's a single person who has not made a mistake. But if you want to be taken seriously in any business or job then you need to be able to seperate your personal opinions from your professional ones. There are times when I would love to shout and give out about something at work, but I don't because that's unprofessional, and no matter how bad a day I am having, I have to remember that it's MY professional integrity that I would be compromising if I acted like a jerk in a very public way.
In Robin's case she chose to rant about her ban to anyone and everyone who would listen, she wrote about it extensively on her blog and spoke about it in podcast interviews in other places.
Now, if that's how she reacts to getting herself banned at an internet site, which, at the end of the day isn't realyl that big a deal, then how would she react to a disagreement with an author, an agent or another publisher? Would she rant and bitch about it in public like she did over this, dragging someone else's name through the mud? As a professional I wouldn't want to deal with anyone who behaved like that. She's shown herself up and it reflects badly on her and her company, which is a shame because Ridan appeared to be doing very well.
If this is her standard behaviour then I, as an author, would seriously question if I wanted them to be the people I trusted with my career.