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but it would nevertheless be very difficult to obtain such a certificate.

Not if you're the government. Just send the root CA a "National Security Letter" and bob's yer uncle.

We were are talking about a random guy in front of the house, not the government.

But the set of "random guys" who might appear in front of your house includes potential government agents.

No, they're nonrandom. And more to the point, it's worth defending against some threats even if you can't cover all.