As someone with an NPD “friend” - I have to look beyond the insults and threats and see the insecurities and vulnerabilities behind them. Most people just can’t or don’t want to do that and will be insulted if not scared away by the things my friend says to them. There’s also a stigma associated with being friends with someone who is abusive - I keep the friendship secret from all but my closest friends, who have a hard time understanding it themselves.
All property is a social construct and is defined by law. So if the law says debt is no longer valid, then the loan agreements cease to be property and there is no stealing it.