Hm. Tough one.
I'm not against the death penalty, although I feel we should moratorium it for a while until the bugs are worked out (and prosecutors who conceal information are sentenced to the death penalty). I have no problem with the death penalty being applied to the guilty, but the problem is with the current court system we do not know that only the guilty are being executed.
On the other hand, I cannot countenance the teaching of lies.
I assume, by "teaching creationism" you do not mean teaching what a theory is and why creationism doesn't fit the definition. You will be doing great harm to those students subjected to the teaching. That harm will be corrected by any who decide to go into the sciences later, as graduating from Pre-Med without understanding evolution is impossible. Teaching creationism in the science class is morally wrong.
On the bad knowledge vs. blissful ignorance question, I came down on the side of "it's better to know" without a single qualm. Truth is very important to me.
This one is difficult. Knowingly lie to an entire generation or possibly have an innocent person executed for someone else's crimes.
I'll have to get back to you on this one.