Wut? nazi germany? Lol, if you still think bombing was to decrease moral, then i don't know what to tell you. I mean yeah its a side-effect but obviously not the main reason.
Anyway airliners, stupid idea. I think thats kinda clear by now.
Point is, yeah people could attack the US but there isn't much to gain besides world domination. Which in itself is useless, but w/e.