PGP allows private conversations to make it out out Communist/repressive regimes, and various other legitimate uses. Encryption protects your BANK accounts, credit cards, financial transactions with the Fed, sensitive personal data etc. As with any technology, it can be abused.
I use PGP every day. and if the government can crack multiple layers of 4096bit keys, more power to them.
That's why repressive regimes can't solve the problem by simply outlawing encryption -- their economies would be cut off from the rest of the world (and economic stagnation is a greater spur to overthrow than abstract ideas about human rights).