Policies which are commonplace in Europe have tended to evolve out of disastrously retarded approaches into sensible ones - American socialists are less kin to European socialists of today, and much closer to the retarded policies in the 70s which stunted your economic booms and led to such great political leaders as the crop you had in the '80s. Thatcher, Mitterrand, Kohl - you know, those guys.
Americans don't necessarily rebuke to the idea of socialized health care - we have medicare / medicaid. If you break it down to a state-by-state level, pay for it with a VAT tax, go through the ropes to show that moving the cost of health insurance away from employers and insurance in general drives the costs down overall, better emulate the German or Swedish systems rather than half-assing it, so on - if you make a case that makes sense, yeah, you'll run into some people adamantly opposed - but most will chew on it. If your argument is "we'll tax the rich at 90%, we'll completely scupper the military budget, and we'll impose massive restrictions on all businesses which corporations will just skirt around while small businesses get the bulk of, further centralizing economic control in the handful of corporate conglomerates which already are arguably monopolistic, and this will somehow pay for offloading an entire, massive industry into the public sector despite its at-face inability to raise funds through anything but debt," you're going to lose most people. "The rich will pay for it" is the beginning and end of the overwhelming majority of "how will you pay for it?" answers. That's what the US brand of socialist tends to argue for - I should know; I've been trying to get them to explain at the most basic level how to fund it. Yang was a rare standout who actually dared to suggest a VAT, and he got swamped and made to dumb it down to stay in good graces.
Similarly, you Europeans have had lots of Green parties over the years that evolved from a bunch of drunk and high hippies into fairly effective political groups that can make or break parliamentary majorities by pushing for some fairly sensible regulations - or regulations which, filtered through parliament, become sensible. What do US greens believe is possible? Well, that we can just ban all air traffic, we can build massive bullet trains across the entire country despite our inability to build a single high-speed rail down the western coast, that we can reach net-zero emissions in ten years, and that we can just ban all gasoline and diesel vehicles in around that same time frame. Oh, and we can also probably get away with banning most of the meat industry just outright, and can probably convert our entire grid to pure renewables within that ten-year frame for zero emissions. Not all of these are ideas in the Green New Deal, but really - give that thing a read.
In both of these cases, there are more measured and reasonable approaches that you could take that make sense and achieve those goals. I generally agree with most of the more sane approaches, but I can't stress this enough - that is not what the American left is pushing for. European-style government intervention finds its home largely in the American center-left, with a contingent of the center gelling for it as well. The right almost universally rejects it, though it's probable that Trumpian populism has created a hankering for Polish / Hungarian welfare + social conservatism.
But whereas you might expect to find the mainstream left and far-left pushing for more of that European-style governing, you instead find an entrenched DNC who seems content to encourage monopolistic corporations to grow in power and reach and control while entrenched public-sector unions essentially bilk government institutions of money and keep them from being even remotely efficient. Do not mistake US unions, public or private, for their European counterparts - it is very, very hard to defend most of what the US teachers' union does, for example. (Yet some degree of teachers' union has to exist, as lacking such a body, school districts try to unload the consequences of their shitty budget management and overspending onto teachers, cutting their benefits and pay to squat - the US system seems to encourage a choice between 'shit' and 'feces' in all regards.)
Going further left, you find a group of radicals so utterly utopic and so utterly convicted of nonsensical socialism that they're almost indistinguishable from Corbynistas - y'know, the group that really helped Labour sink to its lowest in nearly a century for how utterly inane and divorced from reality their platforms were. The American far-left would look at the state of Britain in the 70s and think "well, really, the problem was that a 2-day work week is much more feasible than a 3-day work week!" and blame all of the economic woes which befell the bongs as wholly on the backs of imperialist neocolonial fascist capitalist power structures. Maybe your college radicals calm the fuck down once they start working and begin to advocate more realistic platforms - ours double down and open up patreons and onlyfans, or they sit around drinking and doing drugs and feeling sorry for themselves while blaming all of their problems on the fact that we don't have a dictatorship of the proletariat.
The reasonable and thorough "here's how we do it" is not advertised in the US.