Why don't MEN take responsibility when a WOMAN gets pregnant?

Sometimes it's the woman who has the baby and then leaves the baby with the father as the woman doesn't want the responsibility for raising a child, not all men leave a woman pregnant. Some men don't want to be parents or don't feel ready, there are many reasons why a man might leave but I have found many men who do take their responsibility very seriously.

I have three children with one man and he has took responsibility for all three of them

Men do.

Immature people masquerading as men don't.

This is as much the responsibility of the women who conceive with these men as it is on the men - I can't tell you how many young women I know who are fighting over a "prize" man who already has two or three children with other women, and has already abandoned them, but somehow tell themselves he will commit for life to them and their child(ren).

What kind of world do you live in that men don’t take responsibility? I know i made my wife pregnant, it was on purpose, not an accident that we are having kids. My friend has a son, by accident but he and his ex girlfriend are great at co-parenting him, he took responsibility. Where did you get the impression that men get off scot free?