Random thots here, I might be wrong about some of this since I'm relatively new to Nietzsche but;
OP, you should really read Nietzsches "A genealogy of morals". It is a great book which deals with both weaponized guilt and shame being the power of the weak to tame the strong, featured most prominently and effectively in Christianity (he cites the "blessed are the meek" thing).
Other less obvious sources for this basic idea are Freud's idea about society, as it grows more civillized, forgiveness, reparations, and the taming of the strong man is necessary for man to function in a more complex society.
This hinders the ambitious and aids the weak, creating a more predictable society.
Foccault also talks a lot about this taming of man, in relation to power and punishment. Don't let dumb political considerations hinder you from Foccault or Freud, understand that the Nietzschean view is not merely that social justice is weaponized guilt and shame, but also racial, ideological, and sexual purity. Machiavelli is also an interesting character to consider when thinking about right and wrong, since he shares some views with Nietzsche, though not all.
None of these authors says that guilt, shame, slave-morality is directly bad and something which should be avoided at all costs, instead Nietzsche for instance takes the view that if you're strong enough, you should strive to live according to a creed which you yourself want just because it pleases you, free from shame and guilt (and nihilism) because it is biologically healthy. Now Nietzsche claims that guilt/shame/social justice is more powerful than strong men with their own values (since there are many more weak than strong, and weak people loose, become angry and spend all their time plotting revenge while the chad has fun), but he specculates(or maybe he hopes) in Thus Spoke Zarathustra that the dichotomy can be overcome by the übermensch(i haven't read it so idk how). Napoleon is an example of a strong man with his own values, yet loved by the poor and downtrodden.
If you want to find out more about Nietzsche right now, check out a philosophy-podcast called "partiallyexaminedlife" and their episodes about Nietzsche. Will Durant's "Story of philosophy" is an audiobook with a chapter on Nietzsche which is all over youtube but it really sucks and just tries to write off Nietzsche as juvenile (as a lot of pompous accademics do you'll find)
I hope that wasn't too much of a mess to glean something from lol