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.
It can be done, but I was also part of an election oversight or whatever committee, we counted votes and stuff. One of the things we did was we took a vote urn to the local retirement home and well I witnessed what happened when voting is mandatory. In the past It was mandatory in our country as it was part of the eastern bloc and this man just took the first paper, not even reading which party he voted for and just put it in the envelope and voted that way.
So there are definitely downsides to trying to encourage voting too.