Why fight over a baby that's wanted when there are so many that are not wanted?

There's that phrase about when it rains, it pours. So in a metaphorical way we're in the middle of a flood around our place. There's just been a lot going on to raise our stress and anxiety level.
The one that is the most upsetting to us though is the family that is trying to take away our friend's baby. Our friend was in a very difficult situation about a year ago and voluntarily agreed to allow a family to foster her baby while she could find a job and get her feet back under her. She's a good mom. The government didn't take away her baby. She didn't want someone else to keep her baby. In fact it broke her heart to do it. But she really felt it was the best thing for her daughter and 14 year old son. The foster family was clearly told multiple times that this would not lead to adoption and they said they were fine with that. However, now, 8 months later when my friend is trying to get her baby back they don't want to give her up! They want to keep her and are filing petitions in the court to begin that process. Unbeknownst to us (but they knew) that if they kept her for 6 months then there is legal standing for them to bring this petition.
We're confident that we'll get the baby back. There is no reason for the judge to deny my friend her baby. We're just frustrated over the hurt, betrayal, how much money this will cost, and additional the time she is losing with her daughter after having lost so much already. Beyond that though I am furious that they are spending the time and money trying to take a baby that is wanted by it's mother and who is a good mother. How many baby girls are out there right now whose mothers don't want them or don't care for them? Why aren't they putting this time and money into rescuing one of those babies? And more over, when did people start to think that being poor makes someone an unfit mother? When did it become ok to try to take some one's baby just because you make more money than them or have a bigger house? Poverty is difficult and certainly not necessarily ideal conditions to raise a child but many people (including my mom and both Mike's parents) were raised in poor families. They came out fine and in someways those experiences gave them a lot of compassion for others. Perhaps if these foster parents had some similar experiences they would have more compassion and sense than to think they can just take any baby they want to.