I could see the use of birth control failing some but not at the level to which that poster was saying.
I'm not a Catholic so I can't cite stats.
As a woman though I find it absolutely ridiculous that its always my fault sex ends in a pregnancy when I don't use birth control.
And if trapping a man was the ultimate goal, that's absolutely the worst beginning for a family.
If we have a healthy attitude toward sex then we don't blame people when it results in a new life. That's what it's supposed to do.
If we have a healthy attitude toward sex, though, we keep in marriage where God intended it to be.