As someone who cannot have children I completely understand the terrible sadness that people who want a baby but are denied one experience.
At the same time, however, a child is not an entitlement or a commodity and people do need to think of the consequences of certain courses of action before having a baby, however much they long for one.
The whole surrogacy business can become really really messy, with legal complications, people changing their minds, custody battles, and barriers that nature has put there for good reasons being bypassed - not always in the interests of the child.
Sometimes you just have to accept things in life, unfortunately.