this is the wrong way to look at the problem. the better statement is 'nobody should expect privacy (online)' where i would like to stress the brackets around online as much as i can

if you take steps to ensure privacy you should probably realise that they are all futile in the face of someone making a targetted effort to break it...

eavesdropping, espionage, noseyness - these are nothing new... see most of recorded history for examples.