You say this, but most prison time is done for extreme crime that everyone agrees with. In addition this, prison time is usually reserved for not just crimes we agree with but crimes we all agree are extreme.
Case in point for this specific case it was violent crime, which I'm sure we can all agree is way worse than a racist tweet.
Case in point for this specific case it was violent crime, which I'm sure we can all agree is way worse than a racist tweet.