Home security systems, no matter how expensive and sophisticated, won't stand a chance against this attack. Computer thieves come through the walls too. They steal technical data, bribe insiders, modify software, and collude. They take advantage of technologies newer than the system, and even invent new mathematics to attack the system with. The odds favor the attacker.
Bad guys have more to gain by examining a system than good guys.
Defenders have to protect against every possible vulnerability, but an attacker only has to find one security flaw to compromise the whole system. Yet these systems are still successful because the benefits and conveniences outweigh the losses. A good cryptographic system strikes a balance between what is possible and what is acceptable. Strong cryptography can withstand targeted attacks up to a point - the point at which it becomes easier to get the information some other way. A computer encryption program, no matter how good, will not prevent an attacker from going through someone's garbage.