This is like someone putting spikes and mines on the field after they've played then asking why nobody wants to step on to the field.
They are reaping what they've sown. They should have taken environmental protection seriously. They didn't. They should have harshly punished monopoly attempts. They didn't. They should have at the very least kept tax rates at what they were. They didn't.
At every turn where they could have done something to protect the future and create a world people would actually feel responsible for and would want to improve, they chose to put their own interests and desires first. And now they want to gaslight adults who are saying "I can't see any reason why I should choose to struggle more than I currently am" into being miserable.
The narcissism of boomers created an apathetic and cynical generation who didn't care about anything anymore and actively made fun of you if you did(Gen X) who then encouraged cynicism in millennial people. Now Gen Z is split up into people who want to squeeze the last ounces of wealth still around(largely by scamming everyone) or have just given up and try to manage what little they have.
Actions have consequences and the silver lining is that the kids growing up under millennial parents who actually planned to have them are growing up in homes where the parents are prioritizing those kids being stable, normal, and happy. They're giving their children the lives they deserve. They think their children will be part of a movement that will turn things around and are trying to set them up the best they can to make that dream a reality. I genuinely wish them the best.
For the majority of people who are deciding not to have children, I think that may change if drastic action is taken on climate, housing, Job security and overall peace and safety both domestically and internationally. People are smart enough to know when they're being lied to by people in power and the decentralization of media has allowed people to see footage or hear audio that directly contradicts the lies they're being fed. Look at what happened in 2020 with George Floyd. If smartphones were not recording them, the general public would've accepted the prepared statement the police would've given to the media. Instead we saw worldwide protests at the blatant abuse of power and attempt at covering it up.