You can thank the Nazis for ruining Norse mythology for us. Alfred Rosenburg, in particular, penned many of the Nazi party's philosophical and theological positions. To put it simply, he, among others, sought to remove Semitic thought (including the entire old testament, the gospel of Matthew, and the entire writings of Paul) from the Bible and return Christianity to its pure, Nordic roots. Left without a body of myth to look towards, many Nazis - including Heinrich Himmler, Nazi Germany's #2 man - turned towards a largely forgotten Norse mythology, which was nice and white and suitably "Aryan", and made it their own. You can see this influence everywhere in the Nazi party, and especially anything which Himmler touched, from the twin-sowilo symbol for the SS to the massive archaeological expeditions meant to prove that X historical group or figure was in fact a pure-blooded Aryan and which later inspired the Indiana Jones movies No. 1 and 3.  

After WW2, Nazism was largely taboo, but Norse mythology could slip under the radar, and many "pagan" groups were founded more or less as a cover for Nordic-inspired fascism. It is worth noting that followers of Norse paganism are split into three main camps, and largely have been ever since WW2; the racists (Wotanists), the anti-racists (Odinists), and the guys that just want to do some locally inspired pagan worship and stay out of this political stuff (Asatru)