All your fiat based assets are ultimately secured by the same legal system that today made it illegal for me to host the Bitcoin whitepaper because a notorious liar swore before a judge that he’s Satoshi. A system where ‘justice’ depends on who’s got the bigger wallet.
I don’t think you could get a better advertisement of why Bitcoin is necessary than what happened today. Rules enforced through cryptography are far more superior than rules based on whoever can spend hundreds of thousands of dollars in court.