Because any sort of goodwill attempt to eliminate people from voting will just increase the chance of it being abused by said nazis, well fascists, because nazis were the fascists from germany.
Also fun fact, like many things IQ tests have a history rooted in racism, so if your plan was to use that then bad luck.
Fun fact number #2 the likes of Trump, Orbán (HUN), Fico (SVK) almost always win because of a low voter turnout.
The previous US election had what, 20 million more voters and surprise surprise, Trump lost.
Extremists are always a passionate vocal minority the more you restrict who can vote the easier time they have to take over the election.
If anything suggesting fines for not voting is a far less dumb idea than the shit you just said.