Well ... truth be told that's not actually true if we are realistic & honest,
it's an attempt by the weak & the down-trodden & the wronged to find some sort of reliefΒ by saying to themselves "Oh, the Lord will judge ... or ... you'll get what's coming"
when in fact there's is no reason why the bad guy should get any natural reckoning is there?
there is no heaven & pearly gates, no karmic law of justice & retribution, read some Nietzsche if you need philosophical reasoning to work this out but really its plain as day isn't it,
justice & accounting & all such righting of wrongs are all up to us simple skin & bone humans,
God doesn't judge, & you don't get reborn as a lowly grasshopper you don't ... sorry to say perhaps.
Justice is not thine oh lord, vengeance & judgement are ours & ours alone, don't waste time waiting for some unseen but inevitable law of the universe.