It has nothing to do with that. There is never going to be a completely secure computer because of human error, software complexity, and security flaws. No matter what you do there will always be flaws. There is no guarantee of complete security on a computer. Governments have access to tools which we often are not even aware of yet. The most secure systems are air gapped and not connected to networks. Anonymity, not equipment is often the best protection. Governments tap the data pipeline, not the individual. They tap at the source, the ISPs, radio and telephone systems, and the computer systems. It has little to do with paranoia.