Something causes it. Not always the same thing. Often false witness is lashing out. Which would imply in anger, but possible as a defensive thing too. Still, it is what it is, lying. So lying due to anger, sounds like being angry and sinning. Which the Bible says not to do.
It seems we all slip at times. But willful sin seems to have a special quality. I guess this is what a reprobate would do. Lie, knowing it was a lie, possibly being deceived by their own lie. I can see where being in such a headspace would alienate you from any kind feelings.