It speaks volumes that multiple women would get abortions to avoid him being the father of their children, it stands to reason they weren't as confident in his claims to take full custody as he is in claiming he would have.
A man has a say so before conception, beyond that, it's literally out of his hands. There are a lot of implicit agreements and acceptance of liabilities when two people have sex.
It's absurd to sign contracts without reading them and later complain about the terms just as it's crazy to gamble in the baby casino and be surprised when you hit the jackpot.