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.
I kinda agree. It's a Lib show I won't deny that.
I think Silco is presented as a bit more complex than that though. The guy is brutal, but season one ends with him ALMOST achieving his goal, Jayce agrees to give the Undercity independence with a few reasonable concessions which Silco agrees to uphold. I feel like an even more Lib version of the show would have had him continue to escalate the conflict our of stubbornness and hate, but not he has a clear goal, pursues it without compromise, and seems happy to end the conflict when his goal is reached. I've known a surprising number of Libs who actually sympathize with the character, so I'd argue his writing is pretty effective.