We don't have $1.7 million to spend on voting systems every two years. We eventually have to come up with something that's stable.
We're the blue line between good and bad, and if people are told how to harm us, that line can be crossed and ineffective.
The technologies exist now to desalinate water very effectively, but they cost a lot. It depends on what you're using it for as to whether desalinating it is worth the effort.