This anime was one of my favorites along with Vivy the previous season and the truth is that I really got caught up in the story. what you say is true, the way they presented and worked the discrimination and hatred towards the 86 was great, it gave a very dramatic and sad aspect to the anime without being excessive and making it seem meaningless. the last chapters are the living example of the determination to move forward even knowing that they are going to death.
The OVA confirmed the new season for this October and I'm really looking forward to see how this anime will continue.