This post does not limit itself to true accidents. Indeed, both people involved were negligent. Preventable harm that you do not prevent through your own choices can very well be unforgivable. Pretending that everything should be forgivable is a heinous thing to do to victims, and they have every right to not forgive or forget if you have caused them irreversible harm through negligence or accident. A victim has the right to never forget how you changed their life.
You do not have a right to be free from the burden you have caused someone else.
I can't necessarily agree with this. Some people are hurt over extremely minor offenses, which may or may not have been an accident. What if the perpetrator of the offense has grown and tried to make amends for the wrong they've done? Do they need to carry the burden of guilt forever? I think there is room for forgiveness of oneself, even if those you have burdened do not forgive you. Maybe it's not the same, but everyone is different. I would hate to think that someone in their early teen years did something selfish and stupid (like most of us do), and they were not forgiven by the victim, and they had to carry that with them to the end of their life. Society does not grow with an overwhelming sense of guilt (now, this is very different if you intentionally cause malice and are truly not sorry, and do nothing to make things right).
You do not have a right to be free from the burden you have caused someone else.