Halo wars Genisis

Q:His Biggest mistake... He failed
Q: The Arbiter failed a coup even though he had more than half the race going for him?
C: if the Arbiter was so inflential than why was he sent to prison which he escaped instead of being executed. it would have not only shown fear to the eyes of the people who opposed him but also prevented the arbiter from ever planing another coup.in my opinion it was poor judgement on the arbiters part