Why only Julius Evola? There are innumerable Bad Ideas out there… belonging both to the Politically extreme Left as well as extreme Right. Fascists such as Hitler and Marxists such as Stalin use the same textbook of Hate to lead their nations into orgies of violence against the vilified “Other”.
If it was obvious that a Bad Idea was indeed a Bad Idea, most people would probably not take it up.
But a Bad Idea usually comes dressed up as a Good Idea. Indeed, it often has the germ of a Good Idea within it, but its Truth has been twisted. Bad Ideas promise much gain for little work while eventually delivering much pain - though this is not apparent when they are first examined. Good Ideas on the other hand, promise little and demand much work, though they eventually deliver much benefit!
Humans, being subject to Greed, Ill will and Delusion are invariably attracted to Bad Ideas far more than Good Ideas. 
The best advise here is that of the Buddha (MN61). If each person followed it, demagogues such as Julius Evola would have no support in the world.
When you want to act with the body/ speech/ mind, you should check on that same deed: ‘Does this act with the body that I want to do lead to hurting myself, hurting others, or hurting both? Is it unskillful, with suffering as its outcome and result?
While you are acting with the body/ speech/ mind, you should check on that same act: ‘Does this act with the body that I am doing lead to hurting myself, hurting others, or hurting both? Is it unskillful, with suffering as its outcome and result?
After you have acted with the body/ speech/ mind, you should check on that same act: ‘Does this act with the body that I have done lead to hurting myself, hurting others, or hurting both? Is it unskillful, with suffering as its outcome and result?
So Rāhula, you should train yourself like this: ‘I will purify my physical, verbal, and mental actions after repeatedly checking.’”