They keep advocating for things that won't really help the environment - or actively hurt it. As long as those things pass some kind of "purity test".
For example:
Being against nuclear power.
Plastic straw ban (the replacements are way worse for the environment).
Banning natural gas in homes (using electricity for your stove, water heater and dryer has greater emissions).
Plastic bags vs others types - study after study has shown this helps litter, but is worse in every other possible way.
Recycling plastic rather than burning it. Burning it is better for the environment, but "sounds bad".
Burning plastic isn’t better for the environment than recycling. It is better than landfill, assuming you're using the heat to displace fossil fuels though.
You can check out the waste hierarchy on wikipedia if you care about being well informed about stuff:
Go read a study on the energy and water costs of recycling plastic. But I'll give you a quick summary:
Plastic has two energy components. The energy embodied in it because it's flammable, and the energy to manufacture it.
It takes more energy to recycle plastic, than it does to manufacture it. So why do people want to recycle it? Because they want to recover the energy embodied in it!
But if you burn it, you get that energy back, AND you got to use the plastic for some productive purpose. And since recycling it takes more energy than manufacturing it new, burning plastic is always better than recycling it.
Nuclear power should be obvious.
Plastic straws take FAR FAR FAR less energy than metal ones - don't forget the hot water to wash the metal one. Paper straws are usually coated with stuff, the paper takes more energy that plastic, and the coating doesn't break down - so you don't even get the compost.
So long as we are burning natural gas for energy, it's better to use it directly in your home, vs have someone else burn it, make electricity, then use that.
Plastic bags are good for litter, but you would have to use reusable ones hundreds of times, and never wash them - ever, for them to be better. Not to mention people reuse around half of them for garbage bags, so if you ban them, people still need to buy them.
Happens with other topics, like transgender treatment for kids.
Some people just hate change and being told how they should live.