Korea, Vietnam, Panama, Grenada, Libya, Lebanon, Iraq War I, Somalia, Haiti, Bosnia, Kosovo, Afghanistan, and Iraq War II were all fought for or over democratic ideals & the defense of democratic institutions.

All were driven by multiple competing and sometimes conflicting goals, and many look questionable in hindsight. It is fair to critique.

But it is absolutely not the case that the last time the US defended freedom through military means was WWII.