So Ethiopia, the owner of the aircraft, the employer of the pilots, the supplier of training to those pilots, the ones responsible for their training, the supplier of their chief pilot, and the ones who sold the tickets, is no longer a sovereign nation?
Every level was provided with ample notice. At every level that notice was ignored and the orders given to proceed.
They failed to follow the memory items for the stall warning - 30+ years in existence. Both pilots failed at that, MCAS not involved at all. Were their trainers investigated about that failure? Will their chief pilot go to prison for not recognizing that inability? MCAS didn't do anything to the throttle, which was the pilot's responsibility, but that unattended throttle left the plane uncontrollable at the end. Perhaps counter with "MCAS", but the emphasized part of stall warning procedure is to never engage the autopilot or autothrottle - set pitch and set power. They re-enabled the trim so they could re-enable the autopilot because the control forces from the over-speed due to the unattended throttle were too high. The emphasized part of the AD and the FCOM was "never re-enable the trim" if it is disabled for any reason.
There will be no justice for ET302.