I really do get the sentiment, but I also think about my grandparents who grew up during the great depression and then fought WWII, or really all the incredibly shitty times to be alive throughout history
Where has all that gotten us though? In the interim we've made the world less habitable yet more expensive to live in. I don't want to raise kids just to watch them struggle to make ends meet (as I also struggle to make ends meet)
And there were birth rate dips during those times. WWII only caused a baby boom because it ended and all those soldiers came back horny as hell.
The Great Depression caused a massive drop in Birth rates that took years to recover from, and WWII saw big fluctuations in birth rates until it was over.
This hesitation is normal, people don’t want to have kids when the future is uncertain.
Putting current events in historical context is not even remotely "whataboutism." And it sounds like you're saying your ancestors acted immorally for having children, which may be arguable...