Why immature people have children and act as if they're entitled to think they're right

Just wanted to vent. My good-for-nothing brother just announced that his girfriend is pregnant. Despite my father paying him 2 universities, master's degree and paying for his expenses for more than 30 years, this mf is still in debt, never gets a stable job, spends on cars and brand new clothes while not being able to afford the next month's rent.
And now he proudly states that they're pregnant (never asked the girl's hand even though they've been living together for more than 8 years, saying that marriage is too expensive), and on the top of that he came AGAIN asking for money bc according to him the rest of the family HAS TO pay the medical bills.

Like, why would you choose to put a child in this fucked up world if you can't even afford an ultrasound???