Characters
I mean, casino security is like an onion. It’s layer after layer after layer and the more that you peel back, the more you want to cry.
— Marshall ‧ Alias

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker compares casino security to an onion: layer upon layer, each one peeled back making things worse rather than clearer. The joke turns the usual point of the metaphor into a complaint, suggesting that digging into how heavily guarded the place is only brings tears of frustration.
Context reviewed