Thanks for picking this up.
I hope there isn't any bullshit "redemption" for any of the criminals.
one is kinda redeemable in my opinion and it's the bomber guy, his whole deal is that he was persecuted in america as an immigrant and for that reason he became a terrorist, i am NOT excusing that by any means, but he was shown as a demon in the first chapter (or i assume that's him), now we all know how demons are treated so maybe there's a slight chance he's just retaliating against your typical human racism, still not excusing any lives he takes but among a gun-crazed pillager, rapist monster, pedo priest, jefferina dahmer, and a racist dictator king... yeah, i think he's the only one who could have motives other than "evil for the sake of evil"
NOTE: it can also be noted that some villains are already against each other from the get go, that means the persecuted demon might actually be beefing with his nemesis the racist king just like gunmaker and goblin master, since before reincarnating the racist criminal was shown to be religious, now black people are the least of his worries when there's horned people walking around in this world... again, i'm only assuming based on tropes