the FNF Protagonists go to jail because they thought they could do anything in real life as they did on their game but life works differently..

BF: come on man! Don't do this! grabs the poll bars

Gf: why are we even here? grabs the poll bar

Pico: HEY LET ME OUT! jumps and grabs the poll bars trying to get free

You are the guard...you have to watch them...so they don't try one of those rap battles or whatever...