Even marriages that begin with love as the motivation are subject to the fact that one out of two marriages end in divorce. It seems to me that, as adult married women are succeeding in postponing children until later in life today in order to pursue careers, birth control works when it is used as prescribed. Today, the morning after pill is available in those instances where contraception was not used. Those that are opposed to birth control should practice abstinence. Accidents don't have to happen.
Having a child is an enormous responsibility and I feel it is best attended by a couple willing and able to raise a child. A marriage entered into because of a baby is not a reason to make a commitment that isn't sincere. In fact, the pressures and demands of raising a child, even under the best of circumstances, can tax a couple to the breaking point. Having a baby should be celebrated as a joyous event by two people committed to each other, rather than a burden that eventually makes life miserable for 3 people.