Tell me about it. Why do we have this problem and Democrats do not? You never see a Democrat stabbing Democrats in the back but we have this issue with shtbags like Romney. Remember that press conference Romney held to bash Trump for 20 minutes in 2016? I’ve been voting since the 1970s and never in my life have I ever seen that in any party, where a politician bashes his parties own nominee for President.
Because Republicans generally don’t like a dictatorial party structure. Some do, most don’t. The Rats on the other hand love it.
Collectivist Democrats pose as moderate Republicans to run in conservative areas. Republicans think it is “unethical” to respond in kind.