You do not grasp the concept of original sin. You are born into it and cannot escape it. Your debt is paid by the cross. What you seem not to understand is, just by accepting Jesus and what he did on the cross, doesn't magically transform you into something that can no longer sin....and yes we sin unwittingly without thinking about it. Sometimes we sin when we think we are doing the right thing (think about Paul's persecution of the Church). You are correct when you say we love sin. We love it because we possess the trait of pride. Pride is what leads to all sin. If you have pride, you sin. You war with your flesh that has lusts. The very part of you that lusts (your flesh) binds you to sin. Christ will liberate you from the flesh eventually, and then, and only then will you be unable to sin. Until then, you will sin. God understands this. Jesus said the spirit is willing, but the flesh is weak. It is the flesh that sins and not the spirit. This is why Paul says it is not he who sins but the sin that dwells within him via the flesh. So what can you do? Rip the flesh off your body? No. But you can pray for forgiveness each time you sin (the cross covers the debt of sin, but praying for forgiveness brings one back into the Will of God).
You see, saved, sin is more than a choice, it is an entity unto its own as Paul clearly states in Romans. It dwells inside us. We are victims to it....slaves to it even. We have the choice not to sin, but without God's intervention, we cannot overcome sin nor can we willfully choose not to sin without His guidance and help. Just like the lines from Amazing Grace (saved a wretch like me), we are wretched in our human condition. Original Sin is the source of our wretchedness. It is a part of who and what we are, and only through the transposition of Christ's spirit within us, can we be free of it. That's why we can't judge others of their sins, because we are already captives to our own sins.
You make it sound like people who sin are evil. They are not evil because they sin, they are victims of their weakness and inability to be free from sin. Instead of pushing such people away because they do not conform to your idea of righteousness, instead you should embrace them, bring them into your company, and help them in any way you can to fight against their personal sins.
This brings us to the process of sanctification, but that's for another thread.
