I would accept their help.
I want to see PM decriminalized, and that will mean we'll have to get organized and get our hands dirty in the political process and make alliances we wouldn't otherwise make. That's how progress is made. If we don't, then in a generation we'll still be right where we are now. Or maybe we'll be worse off, because the forces that oppose us are organized and they are making progress too.
But the SSM community doesn't have a reason to support us, they already have what they set out to achieve. Now they are just consolidating their victory, and winning the attendant culture war. We represent a risk to them, that our lack of acceptance by the rest of society might drag them back down. Its a smart move on their part to distance themselves from us.
What we can do is appreciate that they have made our task much easier by setting a critical legal precedent. We could try to get our act together as a movement and follow their example, organizing and pressing ahead with some kind of plan, or we can keep going as we are, giving our adversaries plenty of time to bury us for another thousand years.
I'd rather win.