"I'm sure the general public had the exact same mind set of 'no such threat exists' 10 years prior to the nazi's taking over in Germany."
WALLe, another excellent comment!  True, in1924, the Nazi's share of the vote dropped from 6.6% to 3% . No  one saw them as a real threat; not til 1930 did they reach double digits at 18.3%; in '32, 37.3% and 33.1% , and in'33,   with the theme of  "making Germany great, strong, and happy again," their   43.9%, allied with the foolish Nationalists, allowed Hitler to take total control.  
Don't think it can't happen here.  Currently we have a wave of attacks directed at Muslims and Jews, with some even urging  the WWII horror of  Muslim incarceration camps.
Here  in Eugene a few years ago,   Orval Etter's Pacifica Forum brought a string of right -wing extremists to the UO campus--  Holocaust deniers, White Nationalists, "National Socialists" etc; now remnants of  that hate group seem to have turned their fire on Muslims.
Lets' oppose ALL extremists.