Caller ID

I love Caller ID. It's nice to be able to see who's calling before I pick up the receiver. If it's a call for Roxane I sometimes just let it go to voicemail--saves everybody time. If it's somebody I don't want to talk to right now, ditto.

I've noticed that some people who also enjoy Caller ID block their own ID, so when they call me all I see is "Private Party." They're nice ethical people, so they must have an ethical justification. I wonder what it is.