Literally an apartheid state and we're rooting for characters that are committed to "keeping it safe" (this means further militarizing the border between Piltover and the undercity and killing children on accident and feeling really bad about it). There's plot elements that expose how bad Piltover is for undercity citizens, but that's just the other half of both-sidesing the issue and calling it a cycle of violence. No, the REAL and IMMEDIATE threat is Silco, the guy actually committed to resistance against apartheid Piltover and even the Good and Right characters are opposed to him - to the point that they're more willing to work with Piltover, the state that has been oppressing them their whole lives and which they constantly talk about how its oppressed them their whole lives, to take him down. There's even the gem at the end where Piltover is on the verge of granting the undercity sovereignty and freedom to end the fighting, but then someone decides to fire a fucking rocket straight into the room this decision is being made in. It almost feels 1 for 1 equivalents being made to Israel and Palestine based on hasbara narratives.
Jinx wouldn't have her trauma if Piltover wouldn't wage hextech-based class war against Zaun. S2 makes it pretty clear that in a less repressive world, she could have just grown up to be Powder and live a mostly happy life even if there's significant loss and grief in it. Psychology and politics cannot be seperate spheres when you live in a system that inflicts trauma on you and your people and takes away your ressources to deal with it.