That's why Sanders is popular. Because instead of making an emotional argument against socialism - that it has literally killed millions of people in the 20th century alone - Republicans like to talk statistics and debate minutiae.
I think it comes down to the fact that none of the GOP politicians are affected by socialism like we are when they make the type income they do (and don't earn under the table), have exemptions from bloodsucking programs like Obamacare, and live a life of luxury and favoritism the average middle class would never enjoy.