crazy, American political system revolves around 2 parties, so, inevitably, crazies (pardon me) will belong in both parties and they vote. The trick is to keep crazies under 25% on each side, then majority of Ds and Rs will elect moderates within their parties. Maybe someone can count how many Reps in each party belong to the crazy wing. I agree that we here see more of crazy Ds as most of us probably live in blue states. I presume Jewish community in Alabama has a different perspective.
An alternative is to have a multi-party system, like in Italy or Israel, where crazies form their own parties and have representation in parliament. They can then have much larger platform and get influence on their specific interests. It is “more democratic” but historically does not seem more stable. (See: Weimar Republic)