Earlier quoted context omitted.
No, I'm saying that my dad gave me this exact lecture in 2009 but in reverse—he said that the problem with the right is that they play nice while the liberals will do anything it takes to take power and accomplish their goals. Literally the exact same thing that you're saying but in reverse. I think what it actually is is that there are factions within each group who match your description and it is hard to see the f…
I know it will sound like a slight to your dad, but in 2009 many conservative news outlets were pushing this narrative extremely heavily. And, I don't recall any actual evidence to back it up. It was more a weaponized accusation, much as marital infidelity was in the mid/late 90s. Worse, by all evidence since then, the record seems to be far more in the opposite direction. :(
Also, even he was appalled by the turn the Republican party took with Trump. I doubt he would argue the same today. He's a diehard believer in constitutional law, and he projected his ideals onto people who didn't actually hold them.
That said, I do believe the same tendency occurs on the liberal side. It's easy to notice when your opponent cheats, it's much harder to see it when a teammate does.