The kids definitely shouldn’t have been assaulted. That’s fucked up and there need to be suspensions as a result.
But Harbaugh had his team throwing reverse passes and deep bombs with their starters in the game while up 22 with only two minutes left. You do that in a rivalry game, along with all of the talking their players were doing while those plays are being run, and then you run across the field to wave goodbye and taunt the other team when they’re leaving the field… you might want to stay away from them in the tunnel.
Harbaugh will act totally innocent in all of this but his teams have history of being classless and he shoulders some of the blame for setting this type of tone.