Is true because any argument can be dismissed for not living up to her criteria for being 'good'. How about this one?
At some point from conception to birth the mess of cells becomes a human. The exact point at which this occurs is unknown, contentious, and likely impossible to reasonable determine: biologists, philosophers, ordinary joes alike cannot agree when the the thing becomes human. Due to the assumptions and opinions involved in determining this question, it seems it is beyond knowledge and impossible to know to the satisfaction of most people. Any abortion may be equivalent to murdering a human. Murdering is wrong. Therefore, abortion is wrong because it may involve murder.