Well, they've got to fill all those for-profit prisons somehow.
The charges are obviously trumped up. There was no damage done here, making any fine or prison sentence grossly excessive - we're talking about chalk, which is easily removed with soap and water. He is clearly being made an example of for political reasons, which should very much concern people. Another point to highlight is that the judge issued a gag order preventing him from speaking to the media, despite the United States supposedly being a bastion for free speech. Surely the First Amendment shouldn't be suspended whenever somebody risks embarrassing the political establishment?