No they haven't—and I notice you provided no evidence to support such a ludicrous claim. Look at the party platform.
Now, how about my claim of what would happen for "conservative" causes like the repeal of Obamacare, the Progressive income tax, the shrinking Welfare State, etc., if every Republican in (along with the President)—the size of the federal government would start shrinking so fast it would make the Uniparty's head explode.
Despite their shortcomings, libertarians and the LPUSA are light years beyond Republicans in their passion for limited government—but you already knew that...
I'm not going to attempt to defend the GOP. Look up the LPUSA party on how they would of handled WWII.