Sigh...
yeah, I have an opinion but you wouldn't like it.
My only comment remains this. If your wife, son, daughter, husband, brother, mother, father or any significant other ends up dead from a 911-style event and you learn, truthfully, that it would have been avoidable through "eavesdropping"; will you bury your loved one(s) and say, "Goodbye my love, at least they weren't listening to my phone calls."? If your answer is yes, then you have the strength of your convictions and the solace of your principles. But, if you hesitate or say No, then may God help you continue living. Give things like this serious reflection and contemplation.