Please don't take this as an attack on your position. I understand it, but you do bring up an issue I'd like to address generally.
I decided to respond because this an issue that I find is part of the problem in our criminal justice system. One of the foundational precepts of our justice system is that in a criminal case
the defendant is innocent until proven guilty. Most of us are aware of this but we don't seem to really understand what this means, and it is often reflected in just such a position as the member stated in his post above.
People often think that if a person is brought to trial then there must be some valid reason and therefore the defendant is responsible for showing that the reason is untrue. This is reflected in the way we act when we see someone in the news facing charges for some alleged criminal act. We automatically assume they are guilty and treat them as if they were, as recently exemplified by the public reactions to the Zimmerman case.
However, the burden of proof is on the State to prove the case against the defendant.
That is because from arrest until the final jury determination, the defendant is supposed to be considered INNOCENT until proven otherwise. The defendant should not have to say a single word in his own defense. The jury should already accept that he is innocent and instead be looking at the State's case from the position
that each must be convinced of guilt,
not convinced of innocence.
If one is starting from the belief the defendant is innocent, why should one care if the defendant does not testify? There are many good reasons an innocent person might not testify. There are many dangers and few real advantages because the defendant is not going to be allowed to simply get up and say he did not do it. He may have a past that would prejudice the jury if he took the stand. He may be a bad witness in his own defense due to educational, cultural, or social problems. The prosecutor might try to confuse or trip him up by repeated questions rephrased to do just that.
So I would ask anyone who thinks this way to reconsider, and try to think in terms of how best to eliminate such preconceived notions in order to perform valid jury service.