I might rather burn alive then rot in prison all my life and getting raped by bubba. Do you think it's humane to lock people up like dogs and at the tax payers expense in a recession where our country debt is astronomical?
Hmmm..... so instead of a better alternative to either of these, I should just be happyfied to get cooked, or get bonked by bubba (racial slur, btw)?
I think you've deflected and failed to address the point. You asked "Here's a question: was burning anyone at the stake for any reason ever the right thing to do?" (past tense)
As a capital punishment, as a form of execution, NO. The only reason any government would/did use such a method is/was to induce fear and avoid a challenge to said government, and that, IMO, is not the right thing to do.