Originally Posted by
Badou
I feel like the circus connection should have happened naturally over decades. Over a Snyder trying to do it all at once like with Wayne Enterprises, but I guess it is more like Arkham Asylum. Arkham tends to be used as a vehicle to introduce weird things into Gotham, but that should have been spread out over places like Haly's too I think. So in context of a movie it probably makes it easier to use a strange setting like a circus to introduce bizarre or weird villains into a grounded Gotham setting. Once Haly's shut down in Gotham the workers would naturally filter into the city, or would have jumped to the city with the circus stopping there over the decades. The Gotham TV show is the first property to touch on this idea I think.
And like what The Kid said above, Gotham always feels retro by design. So a setting like a circus I think would fit fine when you have a places like Arkham Asylum. Since the whole asylum name and function is very dated as well. Those places don't really exist anymore and have been replaced with more modernized institutions and hospitals, but those places aren't as "colorful" as the traditional gothic inspired asylums. So the same idea would work for the traditional circus look and design.