Spectacularly idiotic assessment. The right has never "governed" because they don't believe in government, much less democracy.
"The left" is making the same mistakes all of us on the left make: Believing there are sane adults in government who would like to not shit in our own water supply. There aren't. There are money-hungry assholes who would rather pocket $500k annually than take one tiny step toward a climate bill, or one tiny step toward fixing the childcare crisis, or one tiny step toward easing inequality in even the smallest way.
There's nothing "moderate" about Joe Manchin. He's a corrupt shill for the coal interests. That's not "moderate."
As for the rest of your post, it's really stupid to compare 1950s Hungary and 2020s Ukraine. Hungary was a homegrown revolt. This is an outright invasion by a hostile, genocidal foe against a democratic government. And Ukraine has the ability. They can hold the capital, and the entire west of Ukraine, and they have 45 million people, not 10 million. Of course we have to stand up to Russia.
But good luck getting 70% of your party to believe that. Tucker Carlson and Trump are the rule in your party, not the exception. They believe in one-party rule, autocracy, and ethno-nationalism. They've been quite clear on this point.