I agree wholeheartedly with this.
I think on the Left we're our own worst enemy. Our far Left folks want to reject everything when it's imperfect/centrist etc whereas thr Far Right seem fine working with government etc and end up advancing their aims.
Personally, I'm also not sure how widely embraced our more socialist tendencies would get us. In a pretty Left leaning city like NY, Mamdami ran pretty much as our wet dream candidate and still couldn't hit 50% of the votes. And I think that our inability to see that a majority of the country may not agree with us really skews our perceptions.