Flesh Fairs are like 18th Century English execution sites like Tyburn
When you see baying mobs of peasants cheering for the deaths of organic people via executions long ago, it is so eerily similar to the Flesh Fairs of this movie and their "demolition of artificiality" of the mechas there, except back then, it was more or less for petty crimes or crimes against religion.
This sort of thing frightens me and makes me lose hope in humanity, whether it was death against real humans for silly reasons long ago or death against mecha just for existing and threatening humans. It's all really pointless.