The main reason why a public outcry could give Jefferson Davis a better prison is that it would show the harsh conditions he was facing.
This refers to the general rage by the public about an injustice being done that might bring about a change due to pressure.
Hence, we can see that based on the incarceration of Jefferson Davis in the mid-1800s due to his alleged crime of treason, he was placed in a bad prison and this was detrimental to his health.
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