I think I'm taking it a step further even and asking that if Watterson decided that he would never merchandise Calvin and Hobbes and then 10 years later saw things differently and changed his mind, would that be an integrity violation? I don't think so.
No, arguably not. People change their minds over time. We learn things, change, our environment changes. I'm not who I was 10 years ago, but not for a lack of integrity.