Well, the fact of the matter is the Repubs are more than willing to eat their own, to, in true big business fashion, kill the competition to get ahead rather than produce better ideas and solutions. And they prefer to do it out in public with a lot of screaming and shouting, the more witnesses there are, the more dramatic the performance.
The Dems, well, you know the Dems; they'd rather fight their battles away from the public eye in a more "family oriented" way where the daggers and poison gets deployed with more scary smiling, with more discretion and a lot less emotional outbursts.