I once heard an intersting tedtalk about privacy and a lady explained the matter so everyone should be intersted in privacy, and it still is my argument against “i have nothing to hide” conversations:

“online you do not care about privacy only because you don’t see how you are beeing spied on. If a stranger was looking with its forehead on the window inside your living room as you watch tv with your family, you’d tell ’ to fuck off imediately and close the shutter”

The last Airbender