Born again believers should feel the weight of guilt when they have sinned. If there is no guilt and an irrational justification after harming someone else then there cannot be a born again experience.
1 Timothy 4:1–2
"4 Now the Spirit expressly says that in latter times some will depart from the faith, giving heed to deceiving spirits and doctrines of demons, 2 speaking lies in hypocrisy, having their own conscience seared with a hot iron,"