What do you mean by protect your privacy (with lethal means)? You certainly do not have a right to lethally protect your privacy from a neighbor pointing a camera at your house, or similar, for example. You do have a right to protect yourself and your property using lethal means in my state (Texas). But they most certainly had better be both clearly on/in your property and an active threat to your personhood/possessions(property)--extra points for it being nighttime and/or you are female. I am not sure how protecting your physical things or self from an imminent threat is suppose to translate to a space where boundaries and jurisdiction are not as clear cut as your physical self/home.
*Had to take a class (for a concealed carry permit) that laid out in no uncertain terms when the use of lethal force is protected. And it is not as wanton & broad as people like to make it out to be.
Americans do have a constitutionally protected right to use cryptography. You don't have the right to force someone else to use it.
This lethal defense thing has been all about pushing more and more guns on people for financial profit, if there was a way to sell internet guns you have to use to shield your privacy, they would, their number 1. focus is money, everything else is number 2.
The American firearms/ammo/accessories market is only about 1/3rd the size of the American cosmetics market.
Americans just really like guns - there's no shadowy profit motive here. There's simply not enough profit on the table for that.