If you had not noticed, there is no middle ground with the Left, but if you look at their ideology, it will become evident as to why
Global Warming
Those on the Left insist that the entire world fight global warming, and those that refuse must be either forced to change their thoughts, or coerced. There is no middle ground and it MUST encompass the entire globe or all efforts will fail
Promotion of Abortion and Gender Confusion
Those on the Left are preoccupied with overpopulation, which is leads us back to global warming. Simply put, the more people there are, the more global warming their will be. So the only choice they have is to promote policies that reduce population levels, like people killing off their offspring or trying to convince school children by the teachers to convert to another sex so they won't have any offspring.
It is literally all or nothing for these folks who are fanatical about saving the planet. For them, the Constitution and right and wrong, be damned. This is about saving the planet.
Do they really believe in global warming that will destroy the planet? Those leading the charge don't, but the groupies like Gretta who have drunk the cool aid do. After all, if they really believed this then they would be building nuclear power plants, the only carbon free alternative that would meet the power needs of the masses, but they refuse to do so and just tell us to make do with less fossil fuels.