The challenge I proposed
is intended to be an objective exercise otherwise it's pointless because everyone can feel however they want.
Here are some examples of how both a gun and encryption can be used for the same end goal.
X can secure a financial transaction
X can stop a thief from obtaining my credit card information
X can stop someone from forcibly obtaining my identity
X can stop an attacker from obtaining private data stored in my home.
The only thing I've been able to think of that applies to encryption and does not apply to a gun is:
Encryption can verify that a message actually came from me by decrypting it using my public key.
This is objectively true for encryption and objectively false for a firearm. Also a firearm doesn't really help with anything on the internet except maybe a shady craigslist transaction in a dark parking lot. But I meant to imply that a realistic and suitable physical analogy can be applied.