i) Liberals win by cheating. Cheating is an effective way of winning when you can't win by honest means. If at first you don't succeed, cheat and cheat again. Just keep cheating until you win.
They circumvent our Constitutional system of gov't by getting some judges to abuse their power.
The fact that you can win by cheating isn't novel or surprising. Crooks have used that formula since time immemorial.
ii) To some extent, this definitely advances their cause. They got something out of it.
iii) However, it's also a sign of weakness. Even though some states were trending in their direction, liberals knew that wouldn't become a national policy if left to voters, if left to the discretion of the states. They knew you'd basically end up with a red state/blue state stalemate on SSM. The end-result would be a divided policy.
That's why they needed to do an end-run around the democratic process. That was the only way to impose a nation-wide policy.
So that's a backdoor admission that their position lacks the popular support they need. Even though they had some popular momentum, they were bound to hit a ceiling.
They have everything going for them except the votes. In a democratic republic, that only takes you so far.
iv) When, moreover, they resort to coercion rather than persuasion, that provokes resistance. They gain something in the process, but they lose something in the process. People don't like to be pushed around.