What if the "weak" are really the evolutionarily strong, through the fact that they are manipulating the "strong" individuals into sustaining them without them even having to work!
Not saying it is or isn't, just saying it's possible. Is intelligence not a valuable resource? Surely a world of survival of the fittest would include a lot of manipulation of the emotionally weak by the emotionally "strong" (or just sociopathic & manipulative).