[plywoodtrees]

That's a really question that I have considered before, and that deserves a long answer.

One part of it is:

As both a matter of norms and law, we expect and desire more public scrutiny of financial transactions than of speech. In particular, various taxes mean that a large fraction of financial transactions cannot and should not be private. Conversely the great majority of 1 on 1 conversations raise no legal or regulatory issues.