i think this is disingenuous both-sides'ing
im not talking about twitter randos. if you look at the actual elected representatives between the parties, how many elected members of congress are "loony far left"... i mean for the sake of argument id grant the obvious Cori Bush, and then you can work through Omar, Tlaib, Pressley, AOC (thought i'd also argue AOC has tamed quite a bit). in the senate you have bernie (though he's much more measured than any of the others i mentioned).
so first, id ask who else you would consider part of the "extremist element" of the left that currently has power. second, i'd ask if this extremist wing actually is "hijacking" the party. are these people really the ones deciding which way the party goes? absolutely not.
otoh, you look at the right, and honestly you can just start and end with Trump. the guy who called Mo Brooks "woke" because Brooks said the 2020 election is over. Mo Brooks. Woke. trump is still by far the most influential voice on the right. the whole party, even those who dont openly support his election nonsense, are still trying to appease him by constantly centering all discussions around election integrity.
there's no comparison. and thats without even getting into the substance of policy.