So those "freedom fighters" took their training, financing and arms and formed a rogue terrorist group. The only thing that's going to stop them is going to be a WW2 type effort in which civilized nations drop their differences and destroy ISIS.
This is an even worse threat than the Nazis were. That's because in today's world it will be much easier for ISIS to go global, become entrenched, and cause unstoppable end-of-civilization terror.
Based on what's happening, and how slow leaders are to respond to the threat, this is not an exaggeration.
To glom on to what you said...
The Nazi’s were a stronger foe for us militarily, but we were still up to the challenge.
The problem with these ISIL guys, is, yes they are incredibly cruel, fanatical and vicious, yet they are not more formidable than the Nazis of old, but WE (the West) are wussies who don’t understand that war with ISIL is a no holds bar, fight to the death. They can fight that way; we cannot.
Rules of engagement, fear of war crimes and court-martials, bad optics to “only cares about winning and staying in power” politicians, a press Hell bent on “proving” US troops are a weird combination of Storm Troopers and Racist Rednecks, and especially the pussification of the American Male by feminists and nanny-staters means ISIL is more dangerous to us than the Nazis.
A don’t even get me started on the war in the Pacific with the Japanese. Our grandfathers fought that one against an even harder and more determined foe than the Nazis. We had to be crueler just to beat ‘em. In many cases, we had to kill all of ‘em because they refused to surrender! Do you think we could fight that way now?
No.
We’d apologize to the Japanese after Pearl Harbor just to show the world we’re not racists.