Supporting one party over another is not an act of fascism. They promote the GOP because the GOP supports their goals. Do you think it's reasonable to expect them to promote the other party while that party actively works against them?
They promote a stronger police presence in schools, but they also support the right of teachers to be armed and able to defend against attackers. In other words, they support teachers being able to exercise their 2nd Amendment rights. Whether you agree with that or not, the 2nd Amendment is a decidedly libertarian idea. Fascism is authoritarian by nature. Promoting one of these is mutually exclusive with promoting the other.
Regarding police in schools, I don't see how that fits with Wikipedia's definition of fascism: a form of far-right, authoritarian ultranationalism characterized by dictatorial power, forcible suppression of opposition, as well as strong regimentation of society and of the economy. Perhaps we're operating on different definitions.
I also wouldn't think poorly of the NRA for just it's change in how it donates to candidates if they weren't performing illegal coordination and also promoting Republicans candidates even if their opponent was aligned with their 2nd Amendment stance.
Police presence in schools is just a step into a strong regimentation of society IMO. And the 2nd Amendment is far too vague to be considered libertarian. We could debate all day over what the intent was, or how it can be interpreted.
Frankly I don't see why that's relevant. My point is that the amendment itself has become a partisan issue. The GOP and the NRA agree on their interpretation of the amendment, while the other party opposes them. Why would you expect two allies to support their mutual opposition instead of each other, and how does not doing so equate to fascism?
> performing illegal coordination
Political corruption != fascism, and it is certainly not unique to it.
> the 2nd Amendment is far too vague to be considered libertarian
I disagree, but I can see how some interpretations of it (that it's meant to arm militias which are agents of the state) could even be considered authoritarian. However, the NRA advocates for the interpretation that says people should have the means to overthrow their government if necessary. I'm having a hard time seeing how that aligns with fascism.