Killing Jamal Khashoggi is no big deal for Saudi Arabia. But it isn't completely free to do whatever it wants. It's easier to get away with violating human rights within one's own country than with breaking UN international law.
A question on the Big No-No Facebook page: A Saudi Citizen was killed by Saudi Arabians on Saudi territory. Saudi Arabia stills cuts off hands of thieves. Why is this a big deal in America? It's a good one.