Your hypothetical "crime" would be immediately thrown out because you would not be able to prove damages. No crime was committed against a citizen of Hungary, a

Your hypothetical "crime" would be immediately thrown out because you would not be able to prove damages. No crime was committed against a citizen of Hungary, and Facebook is not considered the public at large. A more apt hypothetical would be if you were tricking people into distributing hate symbols from abroad. I think you could make a cogent argument for arrest in that case. The victims of the malware were on American soil. If someone remotely takes control of your smart oven and burns your house down, you have standing to charge them with a crime. The difference is he violated a US law, against a US citizen, while that citizen was in the United States. If you do that and are currently in the US you should expect to be arrested.