Remember, he was an intelligence officer. They tried for years to convince him to surrender with leaflets and "propaganda". Their lack of success in apprehending him probably convinced him even further the war was still going on. How else could his campaign be so successful? He probably just figured when and if the war ended, he'd finally be found and killed. But no, he was able to operate with impunity for three decades.
Remember, he did not surrender to the Philippine government. They were on hand to ensure his protection and extradition. His commanding officer was brought out to the island 30 years later, and he relieved Hiroo of his duties. Up until that moment, Hiroo was following his orders, which quite frankly were military in nature. He was not attacking civilians, he was harassing military and government targets.
Remember, he was ordered never to surrender or commit suicide and to continue fighting until he died or was relieved by his own forces, which is what he did.
That is bushido, or nothing is.
Ok so when you put it like that it does make my earlier statement seem a bit retarded. I guess it's push-ups to me.