I see arguments of this form everywhere:

Law-abiding, tax-paying, responsible citizens use Tool X for legitimate purposes. Criminals also use Tool X for crimes. Therefore, we should ban Tool X.

Tool X = {cryptocurrency, encryption, firearms, drugs, etc.}

Tools that have legitimate uses should not be prohibited to law-abiding citizens.

Absolutely prosecute people who use the tool to hurt other people, but don't prohibit the tools that both bad people and good people use.