The vast majority of crime happens in fiat, not crypto. Monero protects human rights while fiat allows them to be taken away.
For example, Canadian govt used banks to control peaceful protesters to deny them freedom of expression. If they used Monero they wouldn't have had their rights violated.
The percentage of classical fiat used for crime is negligible, when compared with the percentage of blockhain fiat used for crimes.
Moreover, classical fiat makes steps to make crime like ransomware or kidnapping impractical. While crypto fiat works on making them easy