Actually, in the United States, they're significantly more of a threat than the Nazis ever were.
They've already proven that beyond all doubt.
In terms of those killed, yes, you're correct. By that metric MS-13 is more a more significant threat than the Axis powers were.
The Axis powers had millions of troops, fuel supply lines, tanks, battle ships, air forces, etc.
The jihadi's have rental vehicles and air plane tickets.
There's probably a cheaper way of dealing with them than our current plan.