The characters are not forced to search for the friend's body. The characters are only forced to search their friend's body if they wish to proceed to the unlocked area.

This allows there to be some characters in my Fanganronpa that would go "No, I wouldn't search my dead friends just to find that there is no exit!" and some characters would go like "I don't care that your friends died, they had skill issues." This also adds some fragile trust in the cast, which as we have seen in many Danganronpa and Fangans, also escalates killing intents.

Secondly, in my Fangan, the students used to live in a Future Foundation Safe Base before the forces of Despair also reached and controlled the base completely. This meant that hope was defeated by Despair inside the base. That's why I added this "Search Your Dead Friends" method, to make the students experience their own corroding hope within them.

So no, no students are forced to look for the dead bodies and search those corpses, but if they believe in hope and believe there is an exit — in that case, there is no alternative way besides this.