You either didn't read the accounts of the 2 crashes or have no idea what you are talking about. One incident flew for 6 minutes while the captain retrimmed 33 times. Then gave the airplane to a 250hr pilot and never said he retrimmed once. The second one was left at takeoff power until it hit the ground more then 2 minutes later. Every us pilot on the 737 was trained on trim runaway. Turn 2 switches off if that big huge wheel that hits you in the knee all the time is moving uncommanded.