You know, whatever. I'm not a man, nor am I interested in shagging women, so I'll never have that problem. If any unfortunate accident should spring forth from me sex life, fortunately I have the power to make sure it'll never see the light of day.

Fortunately, I have that option.

If I were a man, unfortunately, I would not have that option. This is why I strongly believe in what is the notion of "financial abortion".

So if a woman deliberately tells a man she's using contraction, and she isn't, then YES, I think the responsibility should be on her, not him. And if she can't support the kid - well, than she made a very big mistake, didn't she?
You are also willfully ignoring the fact, that even if contraception fails, a woman is NOT forced to have a child. She can always choose a variety of options to get rid of the fetus before it is born, or choose to give it to adoptive parents, if that is more in accordance with her morals.

Of course contraception can fail, but in a sane relationship, you would pretty much discuss what you would do if that were to happen.

And get out if your partner is a bit nuts...