There are two things that are considered as a sin. Murder and rape. Cheating, stealing, lies and being gay do not come into it. Neither is being fat.
If someone causes grievous harm to another like murder and rape it cuts into their soul and the perpetrator will be forever scared. It cuts deep.
How can murder and rape exist if there was no self or non self? Evidently there was someone who did it. Not no one. There was also a victim.
It is what it is. What is there is there.