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Why not roll physical dice?

How many dice would you have to roll for sending this message? How long would that take?

What about collecting cosmic background radiation and converting it to one-time pad bits?

Hardware random number generators poof of correctness comes from... physics.

Unless there is some fundamental hole in our understanding of physics, including thermodynamics and quantum mechanics, HRNG are the best source.

Using cryptographic ciphers for pseudorandom functions can be catastrophic, as seeding them correctly is a problem. (You still need some entropy from outside for seeding)

Of course, using one time pads is not really practical either.