How do you know they weren't lying? Democrats lie - it's their nature. They can't tell the truth or only the insane would vote for them. They may have thought they were selling a moderate version of what they really intend.
If the last two nights have been a moderated, toned-down version of what they want, then only the insane will vote for them. They don't have to come closer to the truth of what they want to be candidates for an asylum. They're already trying to out-Bernie Bernie.
Part of it is an overreaction to Bernie's success last time. The only reason Hillary won was superdelegates and insider steals. They thought the toxic reaction to Hillary was an endorsement of Bernie. Trump has played them and they've taken insane positions to be oppositional. Even five years ago, they pretended to care about border security. They've also fallen into the trap of believing the controlled media represents the people. Nobody wants to hear what Lena Dunham thinks.
They're also doubling down on "We're gonna put a lot of coal miners out of business."