No there shouldn't be, the only people who should deserve to have a chance at returning are the ones who amend their mistakes before they are caught. Most people who ask for a pardon do so after they have been caught and a lot of the votes are based on how the mods/ admins perceive the "new you", it's really easy to change your character over the internet and there's no way to really know if the person has truly changed. By relying on the pardon system you are assuming people are telling the truth but in most cases there is already evidence of a person's bad character present on the site which is not held into account as much as it should be.
It is also really easy to manipulate people into thinking you have changed through friendships and supportive posts. I'm going to call out dj here because he's the only one I can see who's posted in the pardon.
http://www.sythe.org/12175527-post2.html there's no reason nerfed should be receiving a support after what he did and the support is mainly because he is his friend, not irl but over the internet. I know this wasn't a pardon but even with Sebastian you did the same thing, where you supported him due to his character rather than the evidence present on the site but you weren't the only one who supported him and he was a pretty good lier.
Sorry I called you out DJ but you're the only one I could see in the dispute section at the moment and I've made the mistake before as well helping Novorites get unbanned because I believed he was a good person but he really wasn't and he ended up scamming a lot of money here, none of us are trained enough to be able to fully know if a person has changed and we are relying too much on the person's wording/ bonding than their past actions when voting on a pardon.