Can “civilized” identity be reversed?

Can people regress to a “primitive” state, back to “the cave,” back to the primordial landscape of plains, hills, and tangled forests (or the concrete “jungles” of the south side of Chicago and other violent inner cities including Camden and even Trenton)? Can people descend into evil or bestiality, either temporarily or permanently (is gang membership temporary)? Write 4 pages. MUST BE IN MLA FORMAT. You can use any articles you want. But whenever you use any quotations, make sure you explain that.