I see nothing wrong in it. People should be allowed to change their minds after going 'User Inactive' and many of them are definitely to be welcomed back here.
For example, Nailit (whom I have the highest regard for) initially decided to leave the site but then returned (much to my relief) as Nailedit. There's clearly no deception involved, as it should be obvious to anyone that it's the same user. So I can see no reason why anyone could object to his returning to the site.