It's exactly the same argument Germany uses to send the Bundeswehr to Afghanistan. "Deutschlands Freiheit wird am Hindukusch verteidigt" - "Germany's freedom is defended at the Hindukush."
Abe and his crew are voted in by the older, xenophobic crowd, which remains the majority with Japan's dwindling population.
https://en.wikipedia.org/wiki/List_of_war_apology_statements...
"Apology is a very important thing in Japan."