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Monsanto only goes after farmers who knowingly grew their seeds, and they determine that because the pesticide monanto's "roundup ready" seeds are engineered to be resistant to kills regular plants. You'd never apply it to your crop unless you either wanted to kill it or you knew it was the resistant strain. Do the research.
Last I checked lots of countries now require a minimum state approved education paid for by tax money. That's much better than only educating the aristocracy and putting all the peasant children to work.
Crypto is part of a full solution containing (crypto), proper segregation of permissions, proper segregation of user data / accounts, proper firewall configuration, proper software configuration, patching vulnurabilities, malware detection (lots of solutions on Windows, chkrootkit on linux), and user education. If I forgot anything add it to the list.
Encryption is the best anti-tampering mechanism you have in computing. Well placed encryption protects OS data from tampering, user data from theft, and sensitive communications secured. It's only getting more important.