No candidate is owed votes.
Green party candidates may siphon some votes that might have otherwise gone to a Democratic candidate, but that's the Democrats fault, or choice, depending how you see it.
It's also a pretty important feature of a party like the Green party. Assuming they want specific political actions, they provide the major party of choice: either align your policies closer to ours, or risk losing votes. For the Greens, this is a juxtaposition with the Democrats, and it always has been.
So to say that the Green party candidate hurts the GOP more than the Democratic candidate, is so dumb it makes my head hurt.
But again, those aren't votes the Democrats are owed. It's votes they lost, because their values don't align with those voters.