I think that your emotions are perfectly valid, and I'm right there with you on how strongly you feel about this subject.
Was this class straight "Debate" or Political Science? Or was the debate under a different topic? If the class is debate or poli sci, then maybe you should have put more statistics and emotions into your side of the issue. Unfortunately, the general public isn't well-versed in different types of disabilities & how it often affects decision-making.
Your professor sure didn't sound as though he/she handled the debate very well. It was you against 5 other viewpoints?? No one else was on your side? That's a messed up way to set up a fair debate!!