Still on you. Who did you trust that lied to you? Then starting to ask oneseld: Why did you trust them in the first place. Understanding that part would make it possible not fall for it the second time.
Luckily in many cases this is in fact not “on you”, but rather is a crime, or is subject to civil litigation depending on the nature of the fraud in question. This helps to avoid instances of retributive violence, which is the general solution when a legal system isn’t available.
That's fiat thinking, which is exactly what crypto people want to avoid.
How do they plan to avoid violence when there are betrayals of trust?