Some people have good reasons for doing it. But of coarse no one ever ponders those situations when they think they are right.
A lot of people on this sight think we support it because we want children to be dead. We don't. Anybody hates the idea of babies dying, but to be honest the amount of kids needing to be adopted is growing, with that even if the child lives it'll live a unhappy life, if the mother chooses to give it away, and then even if the child does get adopted it has a high chance of going into a home that is just doing it for the money.
Some times there are situations where if you don't abort the baby, BOTH the mother and the baby will die, if we outlaw abortion a bunch of mothers could lose their lives.
And teens that have children shouldn't be forced to have them, it ruins their schooling, it gives them no chance of getting a honest job. Then the child is forced to suffer if the parents kick the teen out for doing inappropriate things to early.
Parents that want to abort the baby are not ready to be parents, if the father leaves, that will also cause problems for the babies life.