That "mental illness" that Republicans and the NRA blame shootings on is a byproduct of, well, them [View all]
They run on paranoia - They tell people to be afraid of the 'other' (Whether it's people of different colors, different religions, if they are immigrants, of different sexualities, etc.) or that everyone you don't like, and George Soros, are all connected in some nebulous conspiracy against you. They run on telling people that the 'other' is coming to take your money, your job, your life, etc.
They run on delusions other than just paranoia - They tell people that everything is fake, everything is a lie, everyone is out to get you, don't trust what you see, Trump and the Evangelicals are the greatest people ever. Trump is the only one in the whole world who can fix things. People aren't real, they're actors. Events aren't real, they're made up, false flags, fake news, etc. They either run on, promote, or just sit and nod while people like Alex Jones crank out bizarro conpsiracy theories.
They run on the deadly cocktail of anxiety and depression - They tell people things like "America's best days are behind it", that's there nothing to look forward to, that the past was the best time, the present sucks, and the future could only be great if it's some simulation of the past.
Picture the toxic person - Not the mentally ill person, but the person who says wanting help makes you weak, that men shouldn't show emotions like sadness, dismisses counselors and therapy as frauds, gets a mentally ill person a gun instead of thorazine, enables and excuses conspiracy theories instead of getting that person help, and more. Picture that person, now who do they vote for? Let's be honest.
Do Republicans cause mental illness? No. But they are definitely not treating it and they get in the way of treating it over and over.