A lot of this is closely related. Encryption and spread spectrum are sort of tied. Ideally, spread spectrum looks like noise. My carrier isn't a sine wave, but something which looks a lot like a one-time pad. If I'm allowed to experiment with modern transmission, security goes up, at least beyond the level of a casual listener.
I also think you could maintain the spirit of ham radio with encryption. It kind of depends on how it's done. If I establish an encrypted connection to a stranger on the waves, and I'm using the connection to peddle commercial goods, if I do it enough times, someone will report me.
There's also the issue of security when interacting with anything digital. I don't mind remotely controlling equipment in the clear, perhaps, but I do mind if strangers can commandeer it. Signing is good enough for that, but encryption is better. A lot of things I'd like to do -- if I were experimenting with radio -- I don't want hacked.
I also think you could maintain the spirit of ham radio with encryption. It kind of depends on how it's done. If I establish an encrypted connection to a stranger on the waves, and I'm using the connection to peddle commercial goods, if I do it enough times, someone will report me.
There's also the issue of security when interacting with anything digital. I don't mind remotely controlling equipment in the clear, perhaps, but I do mind if strangers can commandeer it. Signing is good enough for that, but encryption is better. A lot of things I'd like to do -- if I were experimenting with radio -- I don't want hacked.