I am, by natural inclination and upbringing, a liberal Republican. My parents were Republicans, my grandparents were Republicans, everyone I knew was Republican. My parents (and the church they took me to) taught me to respect other people, even if they weren't as white or as well off as we were. My parents were disappointed when Goldwater was nommed in 1964 but voted for him anyhow, because they were Republicans.
I'm a social liberal and fiscal conservative. I believe people should be treated equally, the poor should not suffer, and that the government should not spend more than it takes in. If that means the wealthiest one percent have to pay a bit more, so be it.
Perhaps I'm an Eisenhower Republican. The 1950's were a period in which great progress was made in Civil Rights, which were then supported by many Republicans and opposed by southern Democrates. It was the Eisenhower administration that nationalized the National Guard to integrate the schools of Little Rock. And Orville Faubus was a Democrat.
I never left the Republican Party, it left me. Today's GOP is not only racist and elitist, but fiscally irresponsible.
Many, probably most, Republicans are not nuts. What they are is uninformed and misinformed; and they've been Republicans all their lives and can't see how to change. And they are frightened. Frightened by change, frightened by people not exactly like them, and frightened by Fox News and its ilk. Intentionally so, in the latter case.
My late mother was a highly intelligent and well-educated woman. She was raised as a Republican, and raised me as one. She taught me to respect other people; took me to progressive church. But in her last years, she started watching Fox News, which caused her to ask me if Obama was really a Muslim (because Fox was Just Asking Questions) and that she and my father* were destitute because Fox kept telling her Obama had destroyed the stock market. It made me very sad.
Fortunately I was there one day when the mail arrived with a brokerage statement, so I showed her they had a million dollars in their account, and tried gently to explain that she shouldn't trust Fox. I think that helped.
*Dad had been out of it for several years at this point due to illness.