I see multiple scenarios:

1. A crazy person with TDS tries to take him out.

Years of propaganda and fear mongering getting to someone's head, until they finally snap. 

2. Deep state attempts to take him out.

Trump is too destabilizing to their power, and must be delt with. 

3. He put a fake hit on himself to rile up the base.

Creating this illusion will further empower him as the hero fighting against a corrupt system, that he is part of. 

 Obviously 2, like the Kennedy brothers. But number 1 will be the explanation. A lone, crazy gun man. 

The Rothschilds are discontent. But there's always a backup plan. 

 A fake hit with real rifle bullets, though?

At a 130m outdoors, a light breeze the wrong way would have sent that bullet through Trump's eye 

 If it was a real bullet that hit him, then yeah, it wouldn't make sense for it to be a fake hit. However, that's assuming he did get hit by a bullet.