Firearms and abortion became The Issue for so many single-issue voters because of well-funded, relentless fear-mongering.
You can do the same thing with tech privacy, but you're going to have to "play dirty" to accomplish the same thing, and it's going to take decades.
It's also important to note that abortion successfully tied itself into religion, which is not something you're going to be able to do with cryptography.
This might show that the right arguments and lobbying can turn what is not a big political debate into a wedge over time.