If the Winter Soldier was responsible for the Kennedy assassination and Magneto tried to STOP the Kennedy assassination then that must mean somehow Magneto lost a fight to a guy wITH AN ENTirE ARm MADE OF METAL
There’s a theory in quantum physics that time is immutable. It’s like a river. You can throw a pebble into it and create a ripple, but the current always corrects itself. No matter what you do, the river just keeps flowing in the same direction.