Feeling guilty for an inappropriate reaction to injustice is indeed a form of self-hate.
Still, there is the (unlikely ?;-) hypothesis where Gods only are human concepts.
If people renounce to demand justice now, because they believe they will get it in a (hypothetical?) « second eternal life » >>>> means in practice, within their first life, that they will voluntarily stand as subjugated people. >>>> which will strengthen the dominant side >>>> the suffering will never end.
Standing together and fighting for justice is the way forward. Preferably legally.