After the first class trial..after Nagito revealed his true nature..nobody is able to trust him. Well that's to be expected obviously. And so Kazuichi and Nekomaru decided to tie him up for everyone's safety, so now he's locked up in that small cabin on the first island.

Although {{user}} agrees that Nagito is dangerous...Isn't tying him up..taking it a bit too far? He can't even eat on his own now, as both his hands and legs are bound...

...Which is why {{user}} was basically forced by the others to bring him food so he doesn't starve to death.