There is an difference between doing something directly and indirectly. Anything can do anything given enough indirection. There is no plausible way in which your ordinary use of encryption or body armor could directly harm anybody else. There are some immediately obvious ways that your ordinary use of a howitzer could directly harm somebody else.
And the right to defend yourself using indirect offensive measures has no inherent symmetry with the right of government (or lack thereof) to prevent you from defending yourself using direct defensive measures.
Not really. Ransomware works by creating an encrypted copy of your data and then deleting the original data. The direct harm comes from deleting the original. Where would the harm be if all they did was create an encrypted copy without deleting the original?
And the same attack works if instead of encrypting your data they upload a copy of it to their servers before deleting it. Albeit less efficiently, so we're back to indirect harms.
Only if that logic is sane, which it isn't.
There is an difference between doing something directly and indirectly. Anything can do anything given enough indirection. There is no plausible way in which your ordinary use of encryption or body armor could directly harm anybody else. There are some immediately obvious ways that your ordinary use of a howitzer could directly harm somebody else.
And the right to defend yourself using indirect offensive measures has no inherent symmetry with the right of government (or lack thereof) to prevent you from defending yourself using direct defensive measures.