off with their heads !!!!

I want to second the notion that some crimes are so heinous and the proof so positive that death should be the first option.
I'm also in favor of a more liberal application of the term "heinous".

As for the innocent guy?
No one ever REALLY considers his plight.

Would you rather
A spend 40 years in prison and then be found not guilty.
B Be put to death.

Keep in mind that 40 years is enough to drastically change you, especially if you have been stewing in hatred for the system for all that time due to your innocence.
What would there really be when you got out?

Wife? no
Kids? maybe they might let you visit but don't expect them waiting at the gate
job? house?
everything will be different and you WON'T FIT

congrats my friend
you are society's fifth wheel

no thanks, I'll take the needle