L'esprit de l'escalier

I was having a wee debate about capital punishment last night (not with myself you cheeky rapscallion) and the deterrence effect of punishment on levels of crime (next to nought in my opinion) and I've just thought of the question I should have put to my pro-hangin-an-floggin chum:

Do you need the deterrent of capital punishment to prevent you committing murder?

Must remember in future ...