Fringe groups like the head of the RNC and Orrin Hatch who’s been in the senate longer than I have been alive? Is this what you mean by “fringe groups”?
What do you call a bunch of powerful politicians pointing fingers at each other over the demise of the party if not a political civil war?
Fringe groups like the Club for Growth. Maybe "fringe" is the wrong word. Try "lobby" or "advocacy group." I'm not saying they're extremist, just that they have their own particular agenda and don't always speak for a wider public.
You'll find a lot of Republicans who agree with what they claim to stand for in broad terms, but I doubt very many people bother with every press release they issue.
For example, I may agree or disagree with them about protectionism, but I'm certainly not going to sign their petition to keep free trade with China. It's a stunt designed to call attention to themselves.
Politicians like Orrin Hatch trying to settle scores. If he and the other Senators are really bringing all their weight to swatting at this or that advocacy group, then I'm wrong, but I'd be surprised.
Things look different in Washington, though. Orrin might actually think "He was my friend and you drove him out of our party." But to me that looks more like a personal grudge than any "Republican Civil War."