Before I describe why this is probably the worst possible reaction, I'll clarify a few things: I don't expect the recount effort to find any evidence of hacking, and I don't expect it to change the results of the election in any way. The most likely direct effect is a shift of a few hundred votes, although there is a small chance of a major scandal of some kind which I'll address below. So why is this kind of scolding bad?
1. Democratic Party won't fight for you
It's clear that this recount is being funded by money from Democratic Party small donors, not Green Party ones -- given that the amount raised in the actual election was much smaller. So they want to continue to fight. What is everyone saying about the coming age of Trump and possible neo-fascism? Don't give in, don't preemptively surrender, don't normalize, resist. OK, so why isn't the Democratic Party doing this? They are doing what they always do, which is to preemptively give in. Why aren't they supporting what their base wants to do?
The answer to this is presumably that this is a bad fight because it's doomed to failure. But that's a horrible political lesson even if it's realistic. Resistance to a more powerful opponent (i.e. one with the Presidency, Senate, House and SC) means that you resist whenever and wherever you can. And it isn't doomed to failure: there's a small but significant chance of some kind of scandal that will get turned up, because when people look at American election machinery in depth, it's badly maintained.
The second answer is that we *shouldn't* want this scandal to be turned up -- that we have to defend the legitimacy of American elections. Why? I'm an anarchist so maybe I'm constitutionally incapable of understanding this, but we just had an election won by the popular vote loser, with extensive voter suppression efforts. Maybe people shouldn't be told that they have to believe in the system as it is?
2. Technocratic lectures are just what we need right now
Foolish donor base, wasting your money on efforts that will fail because of complicated election law issues that you can't begin to understand! Don't you know that the experts know better? Get back in your box.
3. Insulting your way into an alliance
Now it's time for all of us to come together against Trump, so you leftists are fools / scammers / grifters / vanity cases. That lecture may have had some success against susceptible people back when you were selling the Democratic Party as the lesser evil, but guess what you lost big. If you're going to lose, you have no value as the lesser evil.
There's a big difference between a scam and a foolish project. One that you haven't observed, so why should people listen to you when you say that Trump is scamming? By the way, it is perfectly fine for the Green Party to promote themselves as political actors through activities like this: they are not your adjunct.
4. Blaming people for their marginalization
It's common knowledge that the Democratic and Republican parties have cooperated to make it very difficult for third parties in the American system. Most of the barriers are unheard of in almost any other advanced democracy. So now that you've helped to ensure that the Green Party is marginal, you're blaming them for not having the best election law experts and not being entirely up to speed on the mechanics involved. OK, why is that? The Democratic Party could have done this if they'd wanted to, with all of the expertise that they have.
5. The left /liberal alliance, redux
What, exactly, do people want this supposed alliance to do? What role is the left supposed to have? However you define the left as opposed to the center-left, it's numerically very small in America. The natural role would seem to be protest leadership and radical resistance in general: as the post below mentions, the tiny number of anarchists in America are encountered by police as 1/3 of their 3-part categorization of protestors.
But protest for what, and resistance for what? If it's to return neoliberalism to power, then no thanks! Serious protest is dangerous under Obama and will remain so or become more so under Trump. Are liberals going to support and defend protestors? Of course not. People can already hear the first rumblings of "they're too impolite, they have to not challenge American institutions".
So the message now is back off, crazy scamming vanity-driven hippies, we've got this. Is that really what you want to go with?