Justin Bieber -- He's Allowed to Assault People ... Says Record Producer/Landlord

Justin Bieber's hijinks -- getting arresting for DUI, egging a house and assaulting people -- are simply what 19-year-olds do ... so says the record mogul who's renting his ATL house to the singer.

Dallas Austin was catching a flight Friday night from New York to Atlanta -- he says to check out the mansion -- but insists he's not worried.

You gotta hear Austin's logic and how he dismisses the egging and other stuff.