You are right about this. They were American citizens, and their assets were taken from them and sold.
This is slippery slope stuff.
I broke a nail.
Ultimately it comes to this: we can have this discussion today because we won the war. If we had not won the war a few of us would be around and probably be wondering why the hell our leaders at the time didn't take harsher measures to protect us against internal sabotage and espionage.