I was reading @HappyBoy 's article yesterday when I came across these questions. I understood his answer and why he thinks so, but I thought to answer them for myself.
Is there an unforgivable sin?
This question is a very dicey one to discuss. We as humans are expected to be noble and virtuous, even though we are hardly ever so. One of the most sought virtues is the spirit of forgiveness. The majority of the time, the need to forgive isn't about the offender as it is about the offended. But then there are different levels of wrong that can be done to us.
For some people, dealing with certain kinds of hurt requires them to be able to pin it on someone else and they won't find closure from it until they return the favour. But in and of itself, is there an unforgivable sin? The Bible admonishes us to forgive 70×70×70 times. That's more than enough sins to come for three lifetimes and above. This is the Bible's subtle response to the question. The only thing the Bible labelled unforgivable is blasphemy against the Holy Spirit, something you are not, so no, there's no unforgivable sin that can be committed by humans to humans.
However, some wrongs are so hurtful and consequential, that they cast a big shadow over your life for the rest of your days. Despite one's best effort, one might not be able to get out from under those, unless by God's special intervention.
Does everyone deserve a second chance?
We all like to answer this question with a yes, but let's be practical about this. We all have heard of the Ulvade shooting in the US. That gunman killed twenty-one people, of which nineteen were children. Do you think he deserves a second chance? If he gets one, where's the justice for those little children then? Now, let's say hypothetically, we give such a person a second chance. It's a huge gamble. We are doing it, with the expectation and hope that he's a changed person, but what about the price for being wrong about that? Another nineteen dead children?? Is the possible price for being wrong worth the second chance? Is the risk worth it? It's definitely not. Such people should not even get to remain alive.
I think as far as I'm concerned, the question of whether or not a person deserves a second chance is mostly dependent on what he's done with the first one and the potential harm and risk tied to giving him a second one. So no, not everyone deserves a second chance.
Do we owe anyone an apology for our actions?
When you wring people, you know by default that you owe them an apology. Firstly to those who were directly affected and/or hurt by your actions. But depending on the level of your atrocities, you can fall into debt of a public apology. We live in a society where we have come to expect certain things to be acceptable and some inexcusable. Sometimes, these things go into the equation when choosing where we reside and what we do, even online.
If you were to do something that shakes negatively, the very fabric and sanity of the establishment we've come to believe we need and have, then you don't just owe an apology to those directly affected, but to the public who's indirectly affected as well. Of course, not everyone will give a piss about your apology, but it doesn't mean you don't owe them one. There are those who that apology will go a long way for.
I know some of my takes here might be harsh or controversial, but I try my best to be practical with such conversation. These are not things to be seen from a normative viewpoint, but a descriptive one. Anyways, that's my little contribution to this subject matter.