I'd stay steadfast in my opposition. You can still send the message to society that racism is no longer acceptable while using the two defendants as the example by locking them up.
On the other hand, I wouldn't really care about their deaths. It's like that with awful people sometimes. I'd be more disgusted with the characters and political situation that played parts in the fiasco. That's the thing about being anti-capital punishment; you don't typically feel empathy for the worst offenders who receive it, you care about the families of the prisoner, the possibility of innocence, the permanence of it and the hypocrisy.
I was thinking much the same myself.
I couldn't have worded this in much a better way.