They didn't do this because they are being harsh, they clearly did this because Los Angeles jails are too crowded to give him his own cell. Nor do they probably feel like dealing with giving him extra protection for him to be in the general populace. Can you imagine if they let him be with all the other people in there? It be a hot mess.
It's only because he's high profile is he getting this treatment, or else he'd be in the general populace like everyone else. He'll be out way before that 30 days though, L.A. jails are so dang overcrowded it's not funny.
He's at a jail house, not a full on prison, so things work on a little different. If he is given long term conviction, things would be different. To them, 30 days is nothing.
It's a form of torture and it's inhumane.
It really does more harm than good. It does not help someone reintegrate into society as a reformed individual.