That depends on your stance on many things:
First of all having children or not.
Second of all population ethics.
Third of all if you think it is worth it to have a child whose life is better than neutral, or even than average, but not better than your own.
Existentialism and First Mover Advantage are also related concepts.
I feel your pain though, and my life would have been much worse if my Father had not been an instrumental Flower for part of his life.
But if you consider your life worth living, there are several philosophical paths that do not consider your parent’s actions to be unworthy of moral appreciation. Check Toby Ord on population ethics for deeper insight.
I’m sure there are moral systems where living off your children is an acceptable moral choice, but I can’t say I’m very motivated to check them out.
Their actions were rational from their point of view, however. They just radically overestimated the probabilities of total societal collapse. If that’s what you expect, moving out of the city and trying to live from your garden and some goats might not be the worst course of action.
And how much the state will offer to retirees...