This is because there are large blocks of nominally liberal Democrat voters that are also opposed to extreme environmentalism.
Unions are not big fans of extreme environmentalism because it hurts job creation.
Hispanics are not big fans of extreme environmentalism because it would mean closing the US/Mexico border to protect the Saguaro cactus and would mean increasing the cost of agriculture reducing jobs for illegal immigrants.
Blacks are not big fans of extreme environmentalism because it hurts job creation and it's viewed as an ivory tower concern of uptight white intellectuals.
Most people still want to eat meat and wear leather goods or sit in leather chairs, couches, and car seats.
Most people still would prefer to own a single family home rather than an apartment or condo.
Extreme environmentalism might eventually make it to the top of the list of things to worry about, but for now we have nationalized health care, deficits, debt, declining morals, etc. much higher on our lists.
In spite of everything you listed there, environmentalism is running this country into the ground because folks like you are blind to its dangers. I am amazed at how often people give environmentalism a pass ...