The Human Desire for Vengeance

I am fascinated by the vengeance or ‘imprecatory / cursing’ Psalms. What are they doing in Scripture? Are we meant to be praying them? I mean, I’ve heard people advocating that we can pray this against our ‘enemies’, but that we need to ensure that our hands and hearts are clean in the process. Seriously? I don’t know who you are, but my ‘hands and heart’ are never that clean! In any event, Jesus says something radically different and we are the people of His Way.