We should also bring back rationing, National Service, outside toilets, child labour, back-street abortions, medicinal leeches, witch burning and the flat earth campaign.
Let's ignore the fact that as the only significant democracy to reinstall capital punishment, we'd be a global laughing stock. Let's even ignore the statistics that show it doesn't act as a deterent (most of you seem to anyway, even when it's put to you). Let's brush off the truth about innocent men being put to death not by a knife-wielding mad man but by the state itself whenever there's a miscarriage of justice.
And just go with the bizarre position that we apparently deplore murder so much we actually want to punish it with er... murder. Usually justified by some anecdotal harrumphing about how it feels to be a victim or that thing that happened that time to that mate's husband.